The Wild Kratts crew laments the extinction of different animals in recent history and how they'll never ever be able to see them. Aviva decides that it's finally time to unveil her most secret invention yet -- the Time Trampoline! Using the trampoline, the Wild Kratts jump back in time to meet the extinct series. Science Concept: Extinction -- different types of animals can go extinct and disappear from the planet in a number of ways -- habitat loss, overhunting, etc. Once an animal goes extinct, it is lost forever.