Not every nest in trees is a bird nest! Here's what a squirrel nest looks like and how to deter squirrels from nesting in ...

All tree leaves have an outer layer called the epidermis, which can also be used in the identification process. This leaf "skin" always has a waxy cover called the cuticle and varies in thickness.

The saguaro cactus is the iconic plant of the Arizona borderlands, and in June and early July, its fruit ripens.

The saguaro cactus is the iconic plant of the Arizona borderlands, and in June and early July, its thorn-covered small fruit ...