4.9 to 5.9 feet (1.5 to 1.8 meters)
10.8 to 16.5 feet (3.3 to 5 m)
2,870 to 3,300 pounds (1,300 to 1,500 kg)
Weight (Female)
3,310 to 9,920 pounds (1,500 to 4,500 kg)
Weight (Male)


#Herbivore #Mammals

The Hippopotamus, scientifically known as Hippopotamus amphibius, is a large mammal belonging to the Animal Kingdom’s phylum Chordata and class Mammalia. It is a member of the Hippopotamidae family, which also includes the pygmy hippopotamus (Choeropsis liberiensis). Hippos are semi-aquatic herbivores native to sub-Saharan Africa, inhabiting rivers, lakes, and swamps.

These massive animals are characterized by their barrel-shaped bodies, large heads, and short legs. They have thick, hairless skin that is typically grayish-brown in color, which secretes a pinkish oil that helps protect their skin from drying out. Hippos spend much of their time submerged in water to keep cool and avoid the sun’s heat, emerging at night to graze on grasses and other vegetation.

Despite their seemingly sluggish appearance, hippos are surprisingly agile and can move quickly both on land and in water. They are known for their territorial behavior and can be highly aggressive, particularly during the mating season or when defending their territories or offspring.

Conservation Concerns

The International Union for Conservation of Nature (IUCN) Red List categorizes the Hippopotamus as vulnerable due to habitat loss, poaching, and human-wildlife conflict. Hippos face threats from habitat degradation caused by agriculture, logging, and infrastructure development, which fragment their habitats and limit access to water sources.

Additionally, hippos are hunted for their meat, ivory-like teeth, and other body parts, leading to population declines in some regions. Human encroachment into hippo habitats also increases the risk of conflicts between humans and hippos, resulting in retaliatory killings and further population declines.

Conservation efforts aimed at protecting hippo habitats, reducing human-wildlife conflicts, and implementing sustainable hunting practices are crucial for the long-term survival of hippopotamus populations. Continued monitoring and conservation initiatives are essential for maintaining healthy ecosystems where hippos play a vital role as grazers and ecosystem engineers.

Critically Endangered
Near Threatened
Least Concern

Physical Characteristics

The hippopotamus, or hippo, is a large, mostly herbivorous mammal native to sub-Saharan Africa, and is one of the most recognizable animals in the world due to its distinctive shape and size. Here is a detailed overview of the physical characteristics of the hippopotamus:


  • Body Length: Hippos typically measure between 10.8 to 16.5 feet (3.3 to 5 meters) in length.
  • Height: At the shoulder, they stand about 4.9 to 5.9 feet (1.5 to 1.8 meters) tall.
  • Weight: Adult hippos can weigh between 2,870 to 3,300 pounds (1,300 to 1,500 kilograms) for females and up to 3,310 to 4,410 pounds (1,500 to 2,000 kilograms) for males, with exceptionally large males reaching weights of up to 9,920 pounds (4,500 kilograms).

Physical Characteristics

  • Skin: One of the most notable features of the hippopotamus is its thick, hairless skin, which is a grayish-brown color and can secrete a natural sunscreen that appears red or pink. This secretion is often referred to as “blood sweat,” although it is neither blood nor sweat.
  • Mouth and Teeth: Hippos are well-known for their large mouths and enormous teeth. Their mouths can open to an impressive 150 degrees wide. They have large canine teeth and incisors, which are used in fights and as a display to rivals. The canines and lower incisors grow continuously, with canines reaching up to 20 inches (51 centimeters) in length.
  • Eyes, Ears, and Nostrils: These are located high on their heads, allowing hippos to breathe and look around while mostly submerged in water. Their ears and nostrils can close to protect against water entry when submerged.
  • Legs and Feet: Despite their massive size and bulky appearance, hippos have relatively short, sturdy legs with four webbed toes on each foot. This webbing aids them in swimming and moving through water, where they spend much of their time.
  • Tail: They have a short tail, tipped with a small tuft of hair, which they wag to spread their excrement to mark their territory.

Behavior and Adaptations

  • Aquatic Life: Hippos are highly adapted to a life spent mostly in the water. Their specific gravity allows them to sink and walk on the bottom of rivers and lakes. They can hold their breath underwater for up to five minutes.
  • Thermoregulation: The hippo’s large size and skin secretion help regulate its body temperature, keeping it cool under the hot African sun.
  • Diet: Although they are primarily nocturnal grazers, feeding on grasses, the physical build of their mouth and the tough grinding molars reflect their herbivorous diet.

Hippos play a crucial role in their ecosystem by impacting the environment around rivers and lakes and providing pathways for other animals through dense vegetation. Their physical attributes, combined with their semi-aquatic lifestyle, make them a unique and integral part of the African wildlife landscape.


The reproductive cycle of the Hippopotamus, or hippo, is fascinating and influenced by various factors. Here’s an overview:

Breeding Season: Hippopotamuses do not have a distinct breeding season, and mating can occur throughout the year. However, there may be peaks in mating activity during certain periods, often coinciding with favorable environmental conditions and resource availability.

Courtship and Mating: Mating behavior in hippos involves courtship rituals and displays, primarily conducted by males to attract females. These rituals can include vocalizations, posturing, and physical interactions such as chasing or fighting with rival males. Dominant males establish territories and compete for access to females.

Gestation Period: After successful mating, female hippos undergo a gestation period of approximately 8 months. During this time, the developing fetus grows inside the mother’s womb, receiving nourishment and protection until birth.

Birth and Calving: Hippo calves are usually born in the water, where the mother provides assistance during the birthing process. Calves are typically born singly, although twins can occur infrequently. The newborn calf is immediately able to swim and follow its mother, relying on her for protection and nourishment.

Maternal Care: Female hippos are devoted mothers, nurturing and protecting their calves from potential threats in their aquatic environment. Calves remain close to their mothers, nursing regularly and learning essential survival skills, including swimming and foraging.

Weaning and Independence: Hippo calves are weaned gradually over several months but may continue to nurse for up to a year or longer. During this time, they learn to feed on aquatic vegetation and develop independence, eventually venturing out on their own.

Maturity and Reproductive Success: Hippopotamuses reach sexual maturity at around 5-7 years of age, although males may not establish dominance and successfully mate until they are older. Reproductive success is influenced by factors such as social dynamics, habitat quality, and individual health.

Population Dynamics and Conservation: Hippopotamus populations face various threats, including habitat loss, poaching, and human-wildlife conflict. Understanding the reproductive cycle and behavior of hippos is crucial for effective conservation efforts aimed at ensuring their long-term survival and maintaining healthy populations in their natural habitats.


The hippopotamus, or hippo, is a large, herbivorous mammal found in sub-Saharan Africa. Known for its semi-aquatic lifestyle, the hippo spends much of its time in rivers, lakes, and swamps, emerging at night to graze on land. Here’s an overview of their lifespan and the threats they face:

Lifespan in the Wild: In the wild, hippos typically have a lifespan of around 40 to 50 years. However, this can vary depending on factors such as predation, habitat quality, and access to resources like food and water. Despite their large size and formidable appearance, hippos face threats from both natural predators and human activities.

Lifespan in Captivity: In captivity, hippos can live longer than their wild counterparts due to the absence of natural predators and access to veterinary care. Some captive hippos have been known to live into their 50s or even 60s. However, the lifespan in captivity can still be influenced by factors such as diet, habitat size, social interactions, and overall healthcare.

Threats to the Hippopotamus:

  1. Habitat Loss: The conversion of natural habitats for agriculture, urbanization, and infrastructure development poses a significant threat to hippos. Loss of riparian habitats, including rivers, lakes, and wetlands, reduces the availability of suitable habitat and food resources for hippos, leading to population declines and fragmentation.
  2. Human-Wildlife Conflict: Encounters between hippos and humans can result in conflicts, especially in areas where human activities overlap with hippo habitats. Hippos may raid crops, damage property, and pose risks to human safety, leading to retaliatory killings and negative attitudes towards hippos.
  3. Poaching: Despite legal protections in many countries, hippos are still poached for their meat, ivory-like teeth, and other body parts. Illegal hunting and poaching for bushmeat trade threaten hippo populations, particularly in areas with weak law enforcement and high demand for hippo products.
  4. Pollution: Pollution from agricultural runoff, industrial discharge, and mining activities can contaminate water bodies inhabited by hippos, leading to water pollution and habitat degradation. Toxic chemicals, heavy metals, and waste disposal can harm hippos directly or indirectly by degrading their food sources and water quality.
  5. Hunting: In some regions, hippos are hunted for trophy hunting or traditional cultural practices. While regulated hunting can be sustainable, uncontrolled hunting and overexploitation can lead to population declines and local extinctions.
  6. Climate Change: Climate change poses threats to hippo populations by altering rainfall patterns, water availability, and habitat suitability. Droughts, floods, and changes in temperature can disrupt hippo behaviors, migration patterns, and reproductive success, impacting population dynamics and distribution.

Conservation efforts aimed at protecting hippos include habitat conservation, law enforcement to combat poaching and illegal trade, community-based conservation initiatives, public education and awareness campaigns, and sustainable tourism practices. By addressing these threats and implementing effective conservation measures, it is possible to ensure the long-term survival of hippopotamus populations in their natural habitats.

Eating Habits

The hippopotamus, often referred to as the “river horse,” is a large semi-aquatic mammal native to sub-Saharan Africa. Understanding its eating habits sheds light on its role as a herbivore and its unique feeding adaptations. Let’s explore the feeding habits of the hippopotamus.

Diet: Hippopotamuses are herbivores, primarily feeding on vegetation. Their diet typically includes:

  1. Grasses: Grass makes up the bulk of a hippopotamus’s diet. They consume a variety of grass species found along riverbanks, lakeshores, and other water bodies.
  2. Aquatic Plants: In addition to grass, hippopotamuses also feed on a variety of aquatic plants such as water hyacinth, water lettuce, and reeds. These plants grow in and around water bodies and provide an additional food source for hippos.

Feeding Behavior: Hippopotamuses exhibit several feeding behaviors to obtain their food:

  1. Nocturnal Feeding: Hippos are primarily nocturnal feeders, venturing out of the water at night to graze on grasslands adjacent to rivers and lakes. This behavior helps them avoid the heat of the day and reduces the risk of predation.
  2. Browsing: While feeding, hippos use their wide mouths and powerful jaws to grasp and tear vegetation. They can consume large quantities of grass in a single feeding session, using their lips and tongues to manipulate the vegetation.
  3. Submerged Feeding: Despite their large size, hippos are surprisingly agile in the water. They can hold their breath for several minutes and feed on aquatic plants while submerged. This allows them to access a diverse range of food sources.

Dietary Adaptations:

  • Hippos have large, blunt teeth adapted for grinding tough vegetation. Their molars are well-suited for processing fibrous plant material.
  • The semi-aquatic lifestyle of hippos allows them to access both terrestrial and aquatic vegetation, giving them a diverse diet.

Conservation Concerns:

  • Habitat loss and degradation threaten hippopotamus populations as human activities encroach upon their natural habitats. Deforestation, agriculture, and urbanization reduce the availability of suitable grazing areas for hippos.
  • Human-wildlife conflict poses another significant threat, as hippos may raid crops near water bodies, leading to conflicts with local communities. Implementing conservation strategies that focus on habitat protection and mitigating human-wildlife conflicts are crucial for the long-term survival of hippopotamus populations.


The hippopotamus, often referred to simply as a hippo, is a large, mostly herbivorous, semi-aquatic mammal native to sub-Saharan Africa, and it is known for several unique characteristics:

  1. Size and Build: Hippos are the third-largest living land mammals, after elephants and white rhinos. Despite their stocky shape and short legs, they can run fast and have been clocked at 30 km/h (19 mph) over short distances.
  2. Adaptations for Aquatic Life: Hippos spend a large portion of their lives in water to keep their massive bodies cool under the hot African sun. Their eyes, ears, and nostrils are positioned on top of the head, allowing them to see, hear, and breathe while mostly submerged.
  3. Skin Secretions: Hippos secrete a natural sunscreen substance or “blood sweat,” which is a red-colored liquid that provides protection from germs and sunburn. The fluid is neither blood nor sweat, but a unique secretion that is highly acidic and rich in antibiotics.
  4. Agility in Water: Despite their size, hippos are graceful swimmers and can hold their breath underwater for up to five minutes. They often walk along the bottom of a river or lake.
  5. Territorial Behavior: While hippos are known for their slow movement on land, they can be extremely territorial and aggressive in water. Their large mouths and powerful jaws, which can open up to 150 degrees, are capable of biting a small boat in half.
  6. Vocalizations: Hippos are quite vocal and communicate through grunts, bellows, and wheezes. Some of their vocalizations can be heard up to distances of 5 kilometers (3 miles).
  7. Social Structure: They have a complex social structure, living in groups that typically consist of 10 to 30 individuals, including both sexes and various ages, with a dominant bull overseeing a stretch of the river.

These features, among others, make the hippopotamus a distinctive and fascinating animal within the ecosystem it inhabits.

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1. How long can the hippopotamus stay under water?

Hippopotamuses can hold their breath and stay submerged underwater for about five minutes. However, they often rise to the surface to breathe without waking up or even realizing it, due to their semi-aquatic nature and adaptation to their riverine habitats. This allows them to rest in the water with minimal effort.

2. Why are hippopotamuses considered so dangerous?

Hippopotamuses are considered one of the most dangerous animals in Africa for several reasons:

  1. Territoriality: Hippos are extremely territorial, especially in water. They can become very aggressive if they feel threatened or if their territory is encroached upon. This can be particularly hazardous for people who unknowingly enter hippo territories while navigating rivers or lakes.
  2. Unpredictability: Despite their slow appearance on land, hippos can be unpredictable and can charge with little warning. They can run at speeds of up to 30 km/h (19 mph), which is surprisingly fast for such large animals.
  3. Powerful Jaws: Hippos have one of the most powerful bites in the animal kingdom. Their large mouths can open up to 150 degrees and have massive jaws capable of snapping a canoe in half or causing significant harm to other animals or humans.
  4. Size and Strength: Their sheer size and strength make them formidable. An adult male can weigh between 1,500 to 1,800 kilograms (3,300 to 4,000 pounds), and they use their bulk to assert dominance and during fights.
  5. Aggression During Mating Season: Male hippos are particularly aggressive during the mating season as they compete over females. This heightened aggression can pose additional risks.
  6. Protection of Young: Female hippos are also known to be very protective of their calves and can be aggressive if they sense a threat to their offspring.
  7. Coexistence with Humans: In many areas of Africa, humans and hippos share the same space, leading to conflicts. Hippos may raid crops and, in doing so, come into conflict with farmers. Additionally, fishermen and others who rely on waterways for transportation and livelihood can inadvertently provoke hippos.

Due to these factors, hippos are responsible for more human fatalities in Africa than any other large animal. Their dangerous reputation is a reminder of the respect and caution that must be maintained when sharing habitats with wildlife.

3. How fast can a hippopotamus run?

Hippopotamuses can reach speeds of up to 30 kilometers per hour (19 miles per hour) on land over short distances. Despite their large size and heavy build, they are surprisingly quick and agile, which adds to their reputation as one of the most dangerous animals in Africa.

4. How fast can a hippopotamus swim?

Hippopotamuses are not known for their speed in swimming like they are for their surprising bursts of speed on land. They are more adept at walking or trotting along the riverbed or lake bottom, where they push off from the bottom to move through the water. When they do swim, they do so gracefully, but their exact speed while swimming is not well-documented.

Their movement in water is more about buoyancy and maneuverability than speed. They are capable of propelling themselves in a sort of gallop along the bottom rather than swimming in the traditional sense, using their webbed feet to steer and push off the ground.

Related Family Species

  • Alden, Peter et al, National Audubon Society Field Guide to African Wildlife, New York, NY.
  • Burnie, David & Wilson, Don, Animal, Smithsonian Institute, Washington DC.
  • Clutton-Brock, Juliet and Wilson, Don, Mammals, Smithsonian Handbooks, New York, NY.
  • Hickman et al, Integrated Principle of Zoology, McGraw Hill, Boston.
  • Nolting, Mark, Africa’s Top Wildlife Countries, Global Travel Publishers, Inc., Ft. Laurderdale, FL.
  • Paragon, The Ultimate Guide to Wildlife in North America, Atlantic Publishing, UK.