Amazingly, in some species it is the male that is responsible for sitting on eggs, as well as for nurturing and training chicks. The burden of parenthood is something that male ostriches, rhea, emu (and some other bird species) have to deal with almost exclusively. Female ostriches simply put eggs in front of the male, who carefully rolls them under his body. There can be up to 60 eggs in a single nest. However, even such a big daddy is unable to provide enough heat for all eggs, and some chicks die before they hatch.