The Budgerigar (Budgie) is the smallest species of parakeet, measuring around 6-8 inches (15-20 cm) in length, with various color mutations.
The largest species of parakeet is the Alexandrine Parakeet (Psittacula eupatria), which can reach lengths of up to 23 inches (58 cm), including its long tail feathers. These larger parakeets are native to South Asia and are known for their vibrant green plumage and striking red beaks.
While these two species represent the extremes in terms of size, many other parakeet species fall in between, offering a diverse range of options for those interested in keeping them as pets or observing them in the wild.