Search results
Results from the WOW.Com Content Network
Giraffes gain their long necks by a different heterochrony, extending the development of their cervical vertebrae; they retain the usual mammalian number of these vertebrae, seven. [1] This number appears to be constrained by the use of neck somites to form the mammalian diaphragm muscle; the result is that the embryonic neck is divided into ...
Known as “necking” the giraffes use their long and powerful necks to attack, delivering hard blows with each hit. As you watch the video, you can hear the loud whacks coming from the neck ...
Thus, these nerve cells have a length of nearly 5 m (16 ft) in the largest giraffes. [77] Despite its long neck and large skull, the brain of the giraffe is typical for an ungulate. [79] Evaporative heat loss in the nasal passages keep the giraffe's brain cool. [53] The shape of the skeleton gives the giraffe a small lung volume relative to its ...
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 ...
The okapi's neck is long compared to most ruminants, but not nearly so long as the giraffe's. Male giraffes are the tallest of all mammals: their horns reach 5.5 m (18 ft) above the ground and their shoulder 3.3 m (11 ft), whereas the okapi has a shoulder height of 1.7 m (5 ft 7 in).
Parasitoid use of viruses: parasitoid wasps lay their eggs inside host caterpillars; to keep the caterpillar's immune system from killing the egg, a virus is also "laid" with the eggs. Two unrelated wasps use this trick. [151] Short-lived breeders: species that are in the juvenile phase for most of their lives.
They also will 'swat' with their extremely long and strong necks. Male giraffes become aggressive during mating season. If giraffes sense that their babies (calves) are in danger, they will attack ...
Elephants can use their ears as threat displays in male-to-male competition. Sexual selection in mammals is a process the study of which started with Charles Darwin's observations concerning sexual selection, including sexual selection in humans, and in other mammals, [1] consisting of male–male competition and mate choice that mold the development of future phenotypes in a population for a ...