By Gretel H. Schueller
Migration is among the so much interesting and dramatic of all animal behaviors. From bugs and birds to reindeer and mammoth whales, many animals fly, swim, stroll, or even hitchhike looking for larger nutrients, milder weather, or appropriate mate. a few move complete oceans; a number of even circle the globe. those marathon trips animals take are choked with nice assessments of actual energy and endurance--as good as possibility and occasionally dying. In Animal Migration, examine why animals are forced emigrate and some of the styles and cycles in their migrations.
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Additional resources for Animal Migration (Animal Behavior)
No one wildebeest leads the herd in this migration. They may follow each other, but who travels at the front can change from day to day, or moment to moment. When a predator, such as a lion, scatters the herd, a new animal may take the lead. Wildebeest leave a strong scent along their trail. This smell allows wildebeest that become separated from the group to get back on track. Wildebeest have other navigation tools, too. Some of them may have been learned from taking this difficult journey every Thomson’s gazelles feed on the bottom blades of grass that are left over after wildebeest eat.
Those that do will feast again, filtering amphipods and krill (shrimp-like creatures) through baleen (fringe-like plates in the upper jaw). This will be their first good meal after almost seven months and 10,000 miles (16,000 km) or more of swimming. nAvigAting underwAter Researchers know much more about migratory fliers than they do about swimmers. It seems that swimmers use a variety of tools, just as birds do. The ocean floor is as textured and varied as the land above water. Swimmers may be able to use some of their senses to follow landmarks, such as underwater mountains and valleys, but it is difficult to see through miles of water.
They spend some time in the estuary feeding and adjusting to the salt water. Once salmon enter the ocean, their traveling is not done. Salmon can spend from one to seven years swimming thousands of miles in broad circles through the ocean. The long journey to the ocean is worth it. Bountiful ocean eating turns the small smolts, which weigh just a few ounces, into full-size adult salmon. In the ocean, salmon will feed on plankton, squid, small fish, and krill. The pink color of the krill turns salmon flesh bright pink.