A specialize cell unique to the phylum Cnidaria. It contains a capsule-like organelle housing a coiled thread that, when discharged, explodes outward and functions in prey capture or defense.
The unique cephalopod mollusks can be found in the Indian and Pacific Oceans, living in rock crevices and coral reefs. Several characteristics make the nautilus stand out from other mollusks and marine animals. Unlike other mollusks, the nautilus has a hard external shell, which takes the form of a spiral.As the animal grows, it seals off chambers in the shell which fill with gas, making the shell buoyant so that the nautilus can swim.he beauty of the nautilus shell has inspired many beach-oriented establishments or brands to name themselves after it. One example is the Nautical Hotel in Santa Teresa, Costa Rica. Though the design of the hotel itself bears no resemblance to the nautilus shell, the name conveys a sense of paradise.
Male narwhals feature a unique, defining physical characteristic: a long protrusion from the upper left jaw that looks like a tusk or a horn. In medieval times, people believed that narwhal tusks were the horns of the legendary unicorn.In reality, though, a narwhal tusk is not a unicorn horn.he narwhal, of course! Sometimes called âthe Arctic unicorn ,â narwhals are small whales (about 15-16 feet long) that live in the icy waters of the Atlantic and Russian areas of the Arctic Ocean, near Canada and Greenland. Narwhals are most closely related to the beluga whale.