Starting a thread for this individual book because I've been SO impressed by it. I didn't read Water for Elephants by the same author, but will now give it a try as well. But Ape House has invaded my dreams--recently only the Outlander series has done that, and that was a series of 1000's of pages!
I've always been very interested in primatology, ape language, and the moral/ethical/legal implications (e.g., a kind of Dred Scott decision on apes and their ability to testify in court was something I fantacized about writing a short story about years ago), so I'm sure that is one reason I've so enjoyed this book, but I think it would interest most people. Be sure to read the author's comments at the end, about how much of it is "real"--you'll be amazed.
ETA If there was something that would have made this book even better, it would have been even more time with the bonobos--looking back I realize that they were the part of the book I enjoyed most, rather than the humans, even though there were some very funny and/or interesting scenes with the humans.