A Numbat by Lex
A Penguin by Connor
A Moose by Connor
Some of the endangered animals I drew. We were using the Draw 50 Endangered Animals book pictured below. The kids didn't really care for this book, because the pictures were a little more complex than they were used to drawing, so they didn't want to do as many before taking it back to the library.
I keep track of the books we use for homeschool by taking photos of them on my phone. It works for me, mostly because it isn't a lot of work.