From the creationist's viewpoint, it is the full, glorious array of God's handiwork on Earth. Now then, I'm supposed to operate in the evolutionist's mode here ... let me see ... that tree is your model -- perhaps forced in a few places, perhaps not -- of the allegedly gradual development of all species, gently morphing from one micro mutation to another, until in the fullness of time, such changes seamlessly become macro evolution, "guided" only by the blind, random forces of nature, somehow rising from the slime, diverging from the apes, and culminating in our own intelligent, self-aware species. That's the story, and I'm capable of stating it.
tallhappy said "mammal ear bones from lizard jaws" was junk science and I corrected him for misusing "lizard." But the "-saur" in "dinosaur" means "lizard."
Mammals came from a line of reptiles.
Birds came from a line of reptiles.