Squawks looks like a parrot, acts like a parrot, and moves like a parrot. Yet, his species is more closely related to the common breegull than the parrot. Because the species began to move and act like a parrot, it became a parrot. Looks-like, at least. It's comparable to the way how marsupials look a lot like other mammals because they share the same lifestyle. Tasmanian Devil=Wolverine, Thylacine=Wolf, you get the point. But why is Squawks's species closely related to the Breegulls? The answer lies in its odd way of protecting itself - spitting eggs. Females have insanely quick-working ovaries and screwed-up innards, which means that they can use their unfertilized eggs as projectiles. Quite glaringly similar to a Breegull.
It's more than that, though. Detailed studies revealed oddly similar wing-shapes.