The team learns about orcas, how they hunt and communicate, and their diet.

Daniel, a blind man, uses echolocation to perceive the presence of objects, just like Bats. A team runs him through some tests and find that he's able to create a mental image of his surroundings using sound.

This clip provides an overview of rainforests. It describes their age, unique characteristics, importance to the Earth's overall ecosystem, and importance to modern medicine. It also discusses the recent threat to these habitats: deforestation due to modern industry demands.

Jimmy is afraid of there being polar bears in the South Pole. The brothers assure him that there won't be any of them here.

The Kratts crew watch the mother lemur while she uses her teeth to groom her baby.