That’s where their special pockets and their favorite rocks come in. Researchers have observed sea otters using their chosen rocks in two ways: either as an anvil, placing the rock on their ...

We're starting to realize how smart otters really are. They know how to play basketball. They know how to stack cups, They know how to use rocks to open clams. This type of tool use is ...

For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which are called strata. The study of strata is called stratigraphy, and using a few ...