Coconut crab

The Coconut Crab is a type of nocturnal insect that only appears in. It is the final member of the Crab Family, and the rarest of the three crabs with the sell price of 300 Bells. In real life they are best looked for during the night, which is referenced in-game.

It appears inside of trees, and must be shaken out. They do not occur on the Island's Coconut trees; only those in the village, and when shaken out it falls with a cartoony "plonk" onto its back, where it flips over and attempts to escape from the player albeit very slowly. The Coconut Palms do not require fruit on their branches to contain this "insect", and it is the only bug that can be shaken out of a fruit-bearing tree (Spiders, Bagworms and Bees cannot be found in fruit trees).

Like the other crabs, it makes a scuttling sound when travelling. In the home it is within a Bug Cage adorned with a yellow lid as a reference to its medium sell price.

In Animal Forest e+
Blathers will comment:

Upon donation it scuttles around the Coconut Palm at the bottom left of the bug room.

In Animal Forest e+

 * Coconut Crab

Further Information
Yashigani (ヤシガニ), as they are known in Japanese, is the world's largest arthropod. It is often referenced, as due to the restrictions set by the atmosphere on Earth, it is impossible for an arthropod to be of any greater size in today's world.

Coconut Crabs are omniviorous, and are very occasionally kept as pets (especially in Japan), where they are noted to prefer papaya and other soft fruits. Due to its tropical habitat, they are hard to raise in any location where the temperature is even a few degrees off. In the wild they climb trees up to 6m high and will eat the fruit themselves and also the contents of the trunk. They have poor eyesight which is countered by an amazing sense of smell, and can sense vibrations in the ground.

Their claws are very strong and scissor-like, and are capable of snapping many materials, including fingers. Caution is advised if one must handle these creatures, and it is often recommended that the claws are wrapped before any lifting is attempted.

Fully-grown adults are not capable of swimming, and must rely on their larvae form to transport to other islands. As terrestrial-adapted Hermit Crabs, they breathe via lungs and will drown in the sea.