Elephant Seal
Order: Pinnedia
Family: Phocidea
Genus & Species: Mirounga leonina & M. angustirotris
What they look like:
The elephant seal gets its name because the male has a large snout that looks similar to an elephant’s truck. They are grayish brown in color.
The male seal is very big. Southern males can be as long as 16 feet and weigh over 5,000 pounds. Northern males get up to 14 feet and can weigh up to 5,000 pounds. Females are much smaller – only 10 feet long and weigh between 1,500 and 2,000 pounds.
What they eat:
Elephant seals love to eat fish and squid. They can dive deep down into the water and catch fish on the bottom.
Where they live:
There are two types of elephant seals. The southern seal (M. leonina) lives in the waters off of Antarctica. The northern seal (M. angustirotris) lives along the coasts of California and Mexico in North America.
How they breed:
Elephant seals come ashore to breeding beaches to mate. The maless come first and the pick their territories. The females follow a few weeks later. Here the pups are born from last years mating season. Females usually have 1 pup. The pups are weaned at 4 weeks and the males can mate with the females. The males fight with each other for the right to choose from the females.
Because the male seas are so big the females are often hurt during mating season. Some of the pups are killed during the fighting
Special Characteristics:
Elephant seals stay in the water most of the time. The come ashore during breeding season and to shed their skin during the late summer. This is called MOLTING.
The male puffs up his snout during mating season to attract the females. Moving around on land is not what they do best but they have forelimbs or flippers to help them. In the water they are wonderful swimmers and very graceful and agile.
Cool Facts:
Elephant seas keep warm because of a thick layer of blubber or fat. This fat is also a source of food for them when food is scarce.
The heart of a male seal can weigh over 90 pounds.
Waking up elephant seals is hard to do! They sleep so sound when they are on the beach to mating season you can actually sit on one and not wake it up.
Of all the mammals elephant seals have the biggest difference in size between the males and the females.
More Activities:
Elephant Seal Notebook Worksheet
Elephant Seal Maze
Elephant Seal Coloring
Elephant Seal Crossword Puzzle
Elephant Seal Story Page
More Resources:
Learning Walls - Oceans
Sea Life Stamps
Trackin’ Animals – Mammals in the Savanna, Pine Forest & Ocean
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Phylum: Echinodermata
Class: Echinoidea
Order: Spatangoida
Genus & Species: Echinocardium cordatum
What they look like: Heart urchins are about 2 inches long when fully grown. They have a heart shaped shell which is covered in spines. The spines do not stick up but all lay in one direction.
On the bottom of the sea urchin you will see lots of little tubes that are actually feet. The have suckers on the end and the heart urchin can move them in and out.
What they eat: The heart urchin likes to bury itself in the sand along muddy beaches. Here it can eat particles of dead plants which float in the waters. It sucks up everything – sand, silt, and food. Then its stomach takes out the nutrients and gets rid of the rest. You could say the heart urchin eats his way through the sand!
Where they live: Heart urchins can be found almost anywhere there are muddy beaches. On the east coast of the United States and South America, The west coasts of Africa and Europe, one the shores of Australia and some islands off of Asia.
Special Characteristics: Heart urchins love to hide. They stay buried in the sand eating their way through it. It uses its spines to dig into the sand. It also uses these spines to move around and bury itself.
Heart urchins need to breathe. In order to water with oxygen it digs a small tunnel up to the surface. It lines the shaft with mucus which gets hard. It uses one of its extra long tube feet to keep the tunnel open and let water into the sand.
How they breed: Heart urchins breed in the middle of summer. The female releases eggs into the water. The male releases sperm. The water mixes the two fertilizing the eggs. The eggs develop into larvae which float in the water until they settle on the seabed in shallow areas and finish growing into adults.
Cool Facts
Heart Urchin shells can be found on the beach. The have tiny holes where the legs were. They are called sea potatoes.
Heart urchins will any kind of organic matter.
Heart urchins have radial symmetry. Several segments of their bodies radiate from a central point.
The sea urchin moves its tube-like legs around by hydraulic pressure.
Activities:
Heart Urchin Decode
Heart Urchin Puzzle
Heart Urchin Puzzle Answer
Heart Urchin Story
Heart Urchin Word Search
Heart Urchin Worksheet
More Resources:
Colored Urchin - Live - (6714800)
Sea Urchin Embryology Set - (6482500)
Sea Urchin, Green - Preserved - (6768010)
Life in the Sea - (6611010)
Big Blue Ocean — Bill Nye, The Science Guy - (4725900)