The Burgess Animal Book For Children in "The Squirrels Of The Trees"

"Are there any other Tree Squirrels?" asked Jumper the Hare.

"Yes," replied Old Mother Nature, "there are two the handsomest of all the family. They live out in the Southwest, in one of the most wonderful places in all this great land, a place called the Grand Canyon. One is called the Abert Squirrel and the other the Kaibab Squirrel. They are about the size of Happy Jack and Rusty but have broader, handsomer tails and their ears have long tufts of hair.