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Male giraffes (Giraffa camelopardalis), such as the two pictured here, often engage in necking for various reasons, including combat and competition over females. Males with longer necks and heavier heads are at an advantage in duels and thus have greater access to estrous females, suggesting that the giraffe's distinctive long neck may be a ...
The video above shows the fascinating way male giraffes fight. Known as “necking” the giraffes use their long and powerful necks to attack, delivering hard blows with each hit.
However, such sex differences are primarily limited to the anthropoid primates; most of the strepsirrhine primates (lemurs and lorises) and tarsiers are monomorphic. [2] Sexual dimorphism can manifest itself in many different forms. In male and female primates there are obvious physical difference such as body size or canine size.
Phenotypic differences between sexes are evident even in cultured cells from tissues. [132] For example, female muscle-derived stem cells have a better muscle regeneration efficiency than male ones. [133] There are reports of several metabolic differences between male and female cells [134] and they also respond to stress differently. [135]
A Penn State researcher has been trying to get to the bottom of the age-old question of why giraffes have long necks. Focus on research: Female giraffes drove the evolution of long necks, new ...
Males are nearly 89–105 cm (35– 41 + 1 ⁄ 2 in) tall, and the shorter females 80–100 cm (31–39 in); the head-and-body length is typically between 140 and 160 cm (55 and 63 in). Males weigh between 31 and 52 kg (68 and 115 lb); females are lighter, weighing 28–45 kg (62–99 lb). The species is sexually dimorphic. The tail, that ends ...
The giraffe is a large African hoofed mammal belonging to the genus Giraffa.It is the tallest living terrestrial animal and the largest ruminant on Earth.Traditionally, giraffes have been thought of as one species, Giraffa camelopardalis, with nine subspecies.
The giraffe weevil (Trachelophorus giraffa) is a species of small weevil endemic to Madagascar. [2] They are black-bodied and have bright red elytra covering their wings. . Giraffe weevils are known for their elongated necks, with the males having necks 2 to 3 times the size of their female counte