If you go to a museum you will likely find fossil records, not to mention radiometric dating to place about where they originated from.
There are tons and tons of pieces of evidence and to try and sum it up here would be wasting everybody's time.
I recommend reading The Greatest Show on Earth by Richard Dawkins who thoroughly explains evolution and how it's a fact.
To answer your question, and I'm directing myself at PAPA-BEAR on this one, there is about as much evidence to prove the 'theory' of evolution as there is for the 'theory' of gravity and to make it seem as if there aren't even any middle species in the fossil record not only shows scientific ignorance for the sake of creationist propaganda but it demeans the effort that hard-working scientists throughout time have laboured for.
Shame on those who replace a book with evidence and shame on those too who make claims that anyone in their right mind could prove with 10 minutes of googling. Maybe you shoul read a book; one written less that 2000 years ago perhaps, when the world was still thought to be flat? Oh, and by the way, WE a cross breed of Neanderthal and Homo Erectus. LOOK IT UP.
Yankeeintexas: I appreciate the way you worded this question (with no trap doors to fall into while answering an honest inquiry), so thank you.
Something for the creationists on Hubpages: To find, we must first be open to look.