If you want to read what all the smart kids were reading in 1925, check out my review of Tales from Silver Lands, by Charles J. Finger over at The Newbery Project.
It's got hummingbirds and huanacos and evil white toads (the "Silver Lands" are South America). And the origins of monkeys and armadillos are explained.
The Saline District Library had the original 1924 edition, with this interesting woodcut by Paul Honore on the cover:
If I'd seen the most recent cover, I don't think I would have checked it out of the library: