By Gretel H. Schueller

Migration is without doubt one of the so much attention-grabbing and dramatic of all animal behaviors. From bugs and birds to reindeer and huge whales, many animals fly, swim, stroll, or even hitchhike looking for larger nutrients, milder weather, or compatible mate. a few go complete oceans; a number of even circle the globe. those marathon trips animals take are choked with nice checks of actual energy and endurance--as good as hazard and infrequently loss of life. In Animal Migration, research why animals are pressured emigrate and many of the styles and cycles in their migrations.

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These tags work well for animals that spend time near the surface. the tag turns off when the animal goes underwater. this helps the battery last longer (one battery can last two years). A Pop-up Archival tag (PAt) collects information but does not transmit until the tag releases from the animal. the tag releases on its own either 30 or 90 days after it is attached. After it releases, it floats to the surface. these tags work well for animals that spend most of their time under water. A PAt tag can reveal where an animal was since it was tagged.

Species of tuna occupy all the major oceans of the world. Like many other ocean migrants, tuna feed in cold waters and move to warm waters to spawn. In the warm waters, the fish release their eggs and sperm. North Atlantic bluefin tuna follow a circular route. They tend to swim with the Atlantic Ocean currents, in a clockwise direction. They breed in the warm waters of the Gulf of Mexico. Then they head north, past Florida, in search of better feeding waters along the New England and Canadian coasts.

Males dig burrows for the females. the females stay in these shelters for about 12 days, waiting for their eggs to develop. eventually, the females collectively release billions of fertilized eggs into the ocean. About five weeks later, young crabs will return to the island to follow in their parents’ footsteps. Red crabs make a spectacle when marching to sea off Christmas Island. 5 58 AnimAl migrAtion A wooly undercoat keeps a caribou well prepared for its Arctic journey. Also, its excellent sense of smell allows it to sniff out snow-covered lichens as well as predators.

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