Unfortunately this book [ and the corresponding website ] are in japanese only, so there's a fair amount of guessing involved in our description...
Anyway, here goes:
There's this guy - we think he's japanese - who seems to call himself Kei Craft [ this couldn't be his real last name, could it? ]. He makes paper models of animals.
Actually, judging by the sheer number of paper animals in this book and on his website, he must be spending most of his waking time making them. Incredibly, he even seems to have a fan club and his own store where he sells paper animals of all sizes.

This insane little book includes 12 paper animal construction kits, plus illustrated instructions and photographs of how the finished models should look like. As mentioned before, all the text is in japanese, so you will probably need that little bit of extra perseverance to figure out how to put these things together - but we're sure you'll manage. The illustrations are really good and all the parts are numbered...