Sand dollars are actually the skeletons of marine echinoderms and take their off-white, chalky form after the animal dies. They are closely related to flat sea urchins, starfish and sea cucumbers. When alive, they are covered in short, fine spines and range in color from yellow to blue and purple.Know More
Sand dollars get their name from their size, shape and the coloring of their skeletons. They are 2 to 4 inches across and coin-shaped. The round shape and bleached white color of their skeleton on the beach at low tide is reminiscent of silver dollars.
Sand dollars in their living form exist in marine environments on the sandy ocean floor, usually in shallow waters. They use their spines to burrow into the sand as well as to move over it. In tranquil waters, they stand on end, partially buried in the sand. As ocean currents increase, they flatten out or burrow completely into the sand. They can also grow heavier skeletons by ingesting sand in order to weigh themselves down.
There are male and female sand dollars. The animals reproduce sexually by releasing eggs and sperm into the water. The eggs are fertilized and form larvae, which eventually settle to the ocean floor and slowly change into the flattened, spine-covered creature. They can live anywhere from 6 to 10 years.Learn More
An animal that hunts other animals for food is called a carnivore or predator. These animals must kill other smaller animals to feed. Since carnivores must hunt to survive, they use large amounts of energy to obtain their food, and thus they require many calories to stay healthy.Full Answer >
A fish is an animal. It is a multicellular organism with eukaryotic cells arranged into tissues and organs. Eukaryotic means that fish cells have nuclei and other structures that are protected by membranes.Full Answer >
Among the animals whose names start with the letter "n" are the nutria, nyala, nanger, narwhal, needlefish, night sergeant, northern sennet, natal barred blue butterfly, night butterfly and Northern Jungle Queen. Other animals include the nuthatch, nightjar, northern mole cricket, nectar-sucking blister beetle and nine-spotted ladybird beetle.Full Answer >
According to The Guardian, the UN estimates that between 150-200 species of plants and animals become extinct each day, many without ever being officially discovered and classified by scientists. Mother Nature Network identifies the Baaji dolphin as one of the last "high-profile" extinctions that researchers tracked and confirmed.Full Answer >