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Giraffe necks do more than help them reach high leaves in trees. They can keep a lookout for predators, but there is another reason they may have such long necks.
Further, young giraffes are much more vulnerable to predation than adults: between 60% and 75% of calves die within a year. [12] Mothers hide their calves, which spend much of the time lying down in cover. Since the presence of a mother does not affect survival, Mitchell suggests that young giraffes must be extremely well camouflaged.
This grouping strategy reduces predation risk because larger groups decrease each individual's chance of being hunted, and predators are more easily seen in open areas. [53] The seasonal presence of thousands of migratory wildebeests reduces local lion predation on giraffe calves, resulting in greater survival of giraffes. [54]
The giraffe is a large African ... adult giraffes move about to gain the best view of an approaching predator, ... valves to prevent blood flowing back into the ...
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There is a strong evolutionary pressure for prey animals to avoid predators through camouflage, and for predators to be able to detect camouflaged prey. There can be a self-perpetuating coevolution, in the shape of an evolutionary arms race, between the perceptive abilities of animals attempting to detect the cryptic animal and the cryptic characteristics of the hiding species.
The U.S. Fish and Wildlife Service has proposed new protections for giraffes, saying their populations are threatened by poaching, habitat loss and climate change. Giraffes need endangered species ...
Some authors have argued that adult giraffes are cryptic, since when standing among trees and bushes they are hard to see at even a few metres' distance. [55] However, adult giraffes move about to gain the best view of an approaching predator, relying on their size and ability to defend themselves, even from lions, rather than on camouflage. [55]