I just read the cutest little book by Ursula LeGuin. Ursula LeGuin is known for her adult fantasy/SciFi novels. I didn't realize until recently that she wrote anything for children.
Catwings was written in 1988 and is geared toward elementary aged children. It opens with a mother cat and her four kittens, who happen to have wings. They live on a street that has gotten progressively more dirty and dangerous. The mother cat is a little worried about her children with wings, but loves, cares for them and feeds them well. As they grow things get more dangerous on the street. One day something happens that makes the mom tell her children to use their wings to fly to a safer place.
The winged cats fly away and the rest of this short story is about how they find a place to stay, and eventually find a home.
There are at least three more books (three more here in the library I work in, anyway) that are a continuations of this story. The books don't have any graphic violence, are very tame reads. These are good for the younger elementary school age child, and have a few challenging words to read. I was able to read it in about 20 minutes.
Cat Book Challenge