All the animals you see on this evogram are synapsids, the group that gave rise to the mammals. Sometimes synapsids are called "mammal-like reptiles;" however, that is misleading because synapsids are not reptiles. Synapsids and reptiles are two distinct groups of amniotes, animals that produce young that are enveloped with a membrane called an amnion that prevents desiccation. All reptiles (including birds) have eggs with amniotic membranes (which some lay and others retain inside their bodies until hatching). And of course all mammals (the clade of synapsids still alive today) reproduce using an amnion, and those that lay eggs (e.g., the platypus and echidna) produce amniotic eggs.