Even though he looks like a cardinal, how could he fall in love with Matilda, which is a chicken?
Also, in the second movie, they had daughters, meaning that they are both Gallus Gallus Domesticus.
Almost all the adult birds on Bird Island have their respective spouses of the same species but with dimorphism.
He looks like a rooster, he has a beak of a rooster, color similar to a rooster, large tail and the size of a rooster compared to the normal birds. There are roosters in Angry Birds Evolution and they look like a bit like Cardinals but they have a snood and different hair.