>>40708385the function of monotremes like platypodes and echidnas was to gradually make earth mammals derived from either theropods or lizards. hard to say. there's fake platypodes, but also real ones with chicken-like skin and feathers for hair. also koalas and great pandas are extinct (and both do nothing but eat the same damn plants, and are faked. today.)
descriptions of the chupacabra indicate it's a hopping dimetrodon. hard to say if dimetrodons were closer to lizards or theropods though.
marsupials are the step after monotremes, to modern earth mammals like deer.