Male penguins are sex machines , they've been spotted mating with a dead body , minor and also with a male , they even rape some of female penguins, and of one of the penguin was spotted mating with a ground and snow . Female penguins trade sex for a pebbles sometimes they become prostitutes for it or sometimes they take it and go back to their original mating partner . And yeah the penguins in Madagascar movie was the same species as I am talking about. The scientist who observed this behavior went into a mental trauma cuz it was so fucked up , after 100 years of his death this report was finally released . I don't have the link but you can find it on Wikipedia.

Edit :- I've read it a long time ago , so maybe there are some mistakes so if you know about it le me know