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Mule deer females usually give birth to two fawns, although if it is their first time having a fawn, they often have just one. [29] A buck's antlers fall off during the winter, then grow again in preparation for the next season's rut. The annual cycle of antler growth is regulated by changes in the length of the day. [29] [31]
One of the principal means of distinguishing the closely related black-tailed deer and white-tailed deer is the growth habit of the buck's antlers. In the case of the Black Tail and California mule deer, the antlers fork in an upward growth, whereas the other species' antlers grow in a forward direction.
As a result of their fast growth rate, antlers are considered a handicap since there is an immense nutritional demand on deer to re-grow antlers annually, and thus can be honest signals of metabolic efficiency and food gathering capability. [12] Increasing size of antlers year on year in different European game species, 1891 illustration
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The elk is the second largest extant species of deer, after the moose. [27] Antlers are made of bone, which can grow at a rate of 2.5 centimeters (0.98 in) per day. While actively growing, a soft layer of highly vascularized skin known as velvet covers and protects them. This is shed in the summer when the antlers have fully developed. [28]
The size and complexity of the antlers increase every year and then remain relatively fixed from the age of 5 onward. The annual development of the antlers is at least partially controlled by ...
Deer grow antlers anew each spring, often at the rate of an inch per day. Now, scientists want to take the cells that power deer antler growth and figure out how to give that same ability to humans.
The Sitka deer or Sitka black-tailed deer (Odocoileus hemionus sitkensis) is a subspecies of mule deer (Odocoileus hemionus), similar to the Columbian black-tailed subspecies (O. h. colombianus). Their name originates from Sitka, Alaska, and it is not to be confused with the similarly named sika deer. Weighing in on average between 48 and 90 kg ...