The sharks are circling ... but those jaws aren't meant to incite panic! The Darwin crew joins a survey team as it tries to unlock the secrets of the docile and endangered sand tiger shark in the wild. The group has chosen Japan's Ogasawara Islands, a World Natural Heritage site, as its research base. Tracking soon leads to a range of locations, revealing never-before-seen behaviors. The discovery of a pair of pregnant sharks and their rather rambunctious fetuses leaves the researchers stunned.

An autumn evening stroll often brings with it a cacophony of cricket cries. Males' love songs fill the air, destined for faraway maidens. How do they produce such amazing sounds? And what are the exacting standards set by their love interests? Singing insects have captured hearts and imaginations for centuries, even making appearances in two of Japan's most celebrated classical novels written over 1,000 years ago. We invite you to venture out and enjoy some of nature's nightly outdoor concerts.