Petricious is a minor character in Rio. He was the one who replaced Nigel, causing Nigel to hate pretty birds. However, he does not speak. He appears during Nigel's song, "Pretty Bird". According to the song, Petricious is also Paraguayan .
↑"...Then I was pushed out for a pretty Polly Parakeet from Paraguay they called Petricious..." - Pretty Bird (Nigel's Song)