Colorful Christmas tree worms can provide a meal ticket for yellownose gobies in the southern Caribbean.

Boxer crabs keep hostages to ensure dinner is promptly served.

Have you ever seen a walking coral? Look out for these amazing and unique creatures if you're muck diving in Bali, especially on the black-sand bottom of Puri Jati.

Have you ever seen a fish swim upside-down? Be on the lookout for tiny, colorful basslets swimming belly-up when you're wall diving in the Caribbean — especially in Little Cayman Island and southern Cuba. Want more Critter Hunt adventures? Go to scubadiving.com.

The colors of a clown crab may scream, "Look at me!" but these little guys are hard to find on the reef. Here's where to look.

Previously thought to exist only in Bermuda, the elusive redback is a wrasse of a different color. Ned and Anna DeLoach found this fascinating fish in Bonaire.

Marine naturalists Ned and Anna DeLoach are on the hunt for Lisa's mantis shrimp in Bali, Indonesia.

Ned and Anna DeLoach are on the hunt for bumblebee shrimp in this month's Critter Hunt.

Jellyfish are the farmers, not the farmed, at this hidden Indonesian lagoon.