Porg

A Porg (Cavyromyornis achtobii) is a species of non-sapient sea-dwelling bird.

Description
Porgs were originally native to the planet Ahch-To in various islands, but due to some interstellar sapient species coming to Earth arriving from Ahch-To, the porgs, which were stowed away, had quickly went to Earth's ecosystems, devastating 35% of the native freshwater fish species and around 15% of the small native saltwater fish species, since no porg-like species are native to Earth. They are stocky in nature, with two short wings, flat, beakless faces, and two webbed feet. Porgs are sexually dimorphic; males were slightly larger than females, and males also have orange plumage around the eyes. Porgs of both sexes are covered in dense feathers, with white coloration on the body and face, and gray to brown on the wings and back. They are much lighter than they look, thanks to a thick outer layer of waterproof feathers with a fluffy underlayer for warmth. They can fly short distances but not far enough to leave their native island on their native planet. They can also run quite swiftly on the ground and are good at maneuvering into small spaces. Porgs have stereoscopic vision; their eyes have brown irises and black pupils. Porgs favor colder environments over warmer environments, although some have adjusted through adaptations to warmer areas.

Behavior
Porgs are capable of performing controlled dives into the sea, where they fetch fish to feed on or pass on to their otherwise helpless offspring, which are called "porglets."