Why animals are a lot smarter than you might think.
Human children often take care of toys like babies, and it seems chimps do too.
What can we learn from how chimps behave?
Meet the Giant Pacific Octopus, perhaps the smartest of all invertebrates and the bane of many a crab fisherman.
These flying insects can see fast-moving objects that humans would completely miss.
They can sense low-frequency rumbles that allow them to pick up when a storm is coming.