An organism's niche is what it needs to grow and survive. One way to coexist is to use different resources, also known as niche partitioning.
Capuchin monkeys punish fellow chimps for taking more than their fair share.
The jury is still out on whether or not chimps are self-aware. Actually, the same goes for young children.
Humans yawn when sleepy to stay alert. But imagine yawning when you're already stimulated.
How are we related to trees? Can we be considered relatives?
Here's an experiment that gives new meaning to mental telepathy. "Harnessing Brain Power" on this Moment of Science.