Is it true that T-rex is actually a bird?

No, T-Rex was not a bird, but T-Rex and his relatives already has many characteristics that contributed to the evolution of birds, such of hollow, light-weight bones and feathers (T-rex juveniles, at least, definitely had feathers). read more

The nomenclature is still being sorted out. T. rex was not a bird insofar as it couldn’t fly and wasn’t descended from anything that could fly - it was on a separate branch of therapod from the flying birds. It had a jaw with teeth, not a beak, and had a long bony tail. read more

Birds evolved in the Mesozoic from theropod dinosaurs and were apparently the only lineage of dinosaurs to survive the end-Cretaceous mass extinction (although several early bird groups actually did disappear in this event). To think of an analogy: imagine that an asteroid suddenly wiped out all mammals except for rats. read more

An iconic scene in an iconic movie- Dr. Alan Grant saves the pair from being a T-Rex’s next meal by staying frozen still since, apparently, their vision is based on movement (let’s just forget about the fact that the dino would definitely have been able to smell them). read more