Get Egg Laying Mammals Example PNG. Learn about egg laying mammal with free interactive flashcards. There are only two kinds of monotremes that survived into the modern age. Asked apr 26, 2019 in science by anik (70.8k points). They belong to order of monotremata of group prototheria of class of mammalla. There are five separate species of egg laying mammal, four species of echidna and the platypus. Multiple and various factors are vital to the incubation of various species of animal. Monotremes are mammals that lay eggs. Birds lay eggs.reptiles lay eggs.but what about egg laying mammals? It also refers to the development of the embryo within the egg under favorable environmental condition.The vertebrates include fishes, amphibians, reptiles, birds and mammals.