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Há 2 dias · The animals made slightly different sounds when communicating with different individual bats, especially those of the opposite sex. [226] In the highly sexually dimorphic hammer-headed bat (Hypsignathus monstrosus), males produce deep, resonating, monotonous calls to attract females. Bats in flight make vocal signals for traffic control.
Há 5 dias · Animals which live in the water can mate using external fertilization, where the eggs and sperm are released into and combine within the surrounding water. [19] Most animals that live outside of water, however, use internal fertilization , transferring sperm directly into the female to prevent the gametes from drying up.
Há 1 dia · The military had two classes of warriors, the ocelotl or jaguar warriors and the cuauhtli or eagle warriors and each dressed like their representative animal. In addition, members of the royal class would decorate in jaguar skins. The jaguar was considered to be the totem animal of the powerful deities Tezcatlipoca [148] and Tepeyollotl. [149]
Há 3 dias · These animals began exploiting more man-made environments, like docks, for haul-out sites. Many docks are not designed to withstand the weight of several resting sea lions. Wildlife managers have used various methods to control the animals, and some city officials have redesigned docks so they can better resist sea lion use.
Há 1 dia · Certain forms of animal-rights activism, such as the destruction of fur farms and of animal laboratories by the Animal Liberation Front, have attracted criticism, including from within the animal-rights movement itself, [16] and prompted the U.S. Congress to enact laws, including the Animal Enterprise Terrorism Act, allowing the prosecution of this sort of activity as terrorism.
Há 3 dias · The term echolocation was coined by 1944 by the American zoologist Donald Griffin, who, with Robert Galambos, first demonstrated the phenomenon in bats. [1] [2] As Griffin described in his book, [3] the 18th century Italian scientist Lazzaro Spallanzani had, by means of a series of elaborate experiments, concluded that when bats fly at night, they rely on some sense besides vision, but he did ...
Há 3 dias · This negative impact on native animal species has led the IUCN to identify the elk as one of the world's 100 worst invaders. [ 93 ] The introduction of deer to New Zealand began in the middle of the 19th century, and current populations are primarily European red deer, with only 15 percent being elk. [ 94 ]
