Wolves provide carcasses for scavengers like ravens, which, in turn, learn to follow wolf howls for food opportunities. Another well-documented case involves goby fish and shrimp, demonstrating the ...

Owning a fish tank is an expensive hobby ... but they’re a fascinating combination. 2. Watchman Goby and Pistol Shrimp Share Burrows Here’s another great symbiotic relationship.

Yellow watchman gobies tend to hide frequently, so they’re not the most active fish. Many owners pair them with the Japanese pistol shrimp because of their symbiotic relationship in the wild.

Oopu, or Hawaiian gobies, are shown after being taken recently from Kahoma Stream in West Maui. Community members are concerned about the overharvesting of the native fish. -- KEKAI KEAHI photo ...