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ALL ABOUT WHALES!
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The Earth is the third planet from the sun.
Echinoderms (meaning "spiny skin") are a phylum of salt-water animals whose living members have five arms or rays (or multiples of five). They are mostly bottom-dwellers. These invertebrates include: starfish, sea urchins, sand dollars, crinoids, sea squirts, sea cucumbers, etc.
Whales use echolocation to sense objects. In echolocation, a high-pitched sound (usually clicks) is sent out by the whale. The sound bounces off the object and some returns to the whale. The whale interprets this returning echo to determine the object's shape, direction, distance, and texture. Bats also use echolocation.
Ectotherms are animals that rely upon the temperature and their behavior (like sunning themselves) to regulate their body temperature. Reptiles are ectothermic.
Some animals hatch from eggs. Fossilized eggs from some prehistoric animals have been found.
Elasmosaurus was a huge Cretaceous marine reptile - a plesiosaur, not a dinosaur.
An embryo is a very young, unborn organism.
An endangered species is a group of animals that is dwindling in numbers and may go extinct soon. Many species of baleen whales are endangered.
Endothermic animals generate their own body heat to maintain their body temperature. Birds and mammals are endothermic.
The Eocene epoch (58-37 million years ago) was the time when primitive whales and many other mammals evolved.
Two or more geological Eras form an Eon, which is the largest division of geological time, lasting hundreds of millions of years.
An epoch is a division of a geologic period; it is the smallest division of geologic time, lasting several million years.
Two or more geological periods comprise an Era, which is hundreds of millions of years in duration.
An estuary is where a river meets the seas. Some beluga whales visit estuaries seasonally to breed and feed.
Eubalaenae is the genus of the right whales. They are baleen whales with no dorsal fin, thick blubber, and large, hairy heads.
Euphausiids are small, plentiful, shrimp-like, crustaceans that live in the open ocean. They are about 1 inch long.
An exoskeleton is a tough, structural body armor made of chitin. Arthropods (insects, arachnids, trilobites, crustaceans, etc.) have exoskeletons.
An animal species that is extinct has died out. Most animal species that ever existed have gone extinct, including all the dinosaurs.
Extinction is the process in which groups of organisms (species) die out.
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