Paragraph 1：A central hypothesis of animal cognition is that many animals make use of cognitive maps—internal representations or codes—of the spatial relationships among objects in their surroundings. In a broad sense, most animals that migrate probably have some internal map of the way external objects are arranged.
Paragraph 2：The most extensive studies of cognitive maps have been made for animals exhibit seasonal migration, the regular back-and-forth movement of animals between two geographic areas at particular times of the year. Seasonal migration enables many species to access rich food resources throughout the year and to breed or winter in areas that favor survival. One long-distance traveler is the gray whale. During summer, these giant aquatic mammals feast on small, bottom-dwelling invertebrates that abound in northern oceans. In the autumn, they leave their northern feeding grounds and begin a long trip south along the North American coastline. Arriving in warm, shallow lagoons off Baja California (Mexico) in the winter months, they breed, and pregnant females give birth to young before migrating back north. The yearly round-trip, some 20,000 kilometers, is the longest for any mammal.
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