The common porpoise, also known as the harbor porpoise, lives throughout the temperate coastal waters of the Northern Hemisphere. The porpoise prefers shallower waters and is most common in bays and harbors.
The shy, elusive mammals are the smallest cetaceans, reaching an average of about 5 feet and 120 pounds. While porpoises are able to dive to great depths, they prefer to remain near the water surface, emerging every 25 seconds to breathe. Unlike most of their dolphin relatives, porpoises bear a rounded head instead of a snout and prominent forehead. The neck of the common porpoise is short and indistinguishable from the rest of its body.Learn More
According to the St. Lawrence Global Observatory, lobsters prefer rocky ocean bottoms covered with algae. They can hide in the rocks, and the algae makes it easier for them to blend in. The algae also attracts food for the lobsters. When lobsters cannot find rocks, they will burrow into pebbles, sand, or clay. Lobsters stay at the entrance of their shelters, claws out so they can defend themselves.Full Answer >
Krill live in all the oceans of the world, the most abundant of which is Antarctic krill. This species, found in the Southern Ocean, has an accumulated weight of between 125 million to 6 billion tons.Full Answer >
The ambulacral groove is a deep linear depression located in the ambulacrum in some echinoderms such as starfish. The ambulacrum is an area in echinoderms that is marked by calcitic plates and located over the radial canals of the internal water-vascular system.Full Answer >
Sharks and whales are enormous ocean creatures that have large, torpedo-shaped bodies and dorsal fins. Both species swim well in the water, use their senses to catch prey and, as meat eaters, rely on carnivorous food to survive. Both the shark and whale have large teeth and huge jaws, and neither seem to show mercy when they kill.Full Answer >