I imagine the evolutionist would declare that at some unsubstantiated point, not demonstrated in the fossil record, the sturdy reptile branch of the tree somehow (randomly?) developed a clearly-defined fork, from which two smaller branches -- birds and mammals -- each managed to blunder along and develop in its own unique and unguided direction. Each of these two mini-branches were somehow possessed of the necessary genetic material to accomplish this fork in the tree. Is that the evolutionist's model?
Trees fork, yes. But not all branches arise from the same spot on the trunk.
Everything so far fits on a tree.
This trend can be expected to continue.
Trees have branches.
Animals with mammary glands came from reptiles.
Other animals without mammary glands came from reptiles.
Do evos think dinosaurs gave rise to anything? Where do the dinosaurs fit in?