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A cow/calf winter herd is a herd that consists only of female elk and their young. In a normal winter, defined as one where there is a decent amount of snow fall, one study found that when the groups of cows and calves were safe from predation by wolves, about 75.6-83.0% of their diet was made up of graze whereas when wolves were present this number dropped to 61.6-69.4%. [3]
Type III or concave curves have the greatest mortality (lowest age-specific survival) early in life, with relatively low rates of death (high probability of survival) for those surviving this bottleneck. This type of curve is characteristic of species that produce a large number of offspring (known as r-selected species).
Antlers are made of bone, which can grow at a rate of 2.5 centimeters (0.98 in) per day. ... Both male and female North American elk grow thin neck manes; females of ...
Newspaper clippings from 1997 estimated more than 3,000 spectators came to watch a group of five female rocky mountain elk and calves climb over a hill in a single file and disappear into the wild.
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For months, the DNR has received tips about bull elk No. 357 from the Black River State Forest herd.
An alternative to building a single survival tree is to build many survival trees, where each tree is constructed using a sample of the data, and average the trees to predict survival. [7] This is the method underlying the survival random forest models. Survival random forest analysis is available in the R package "randomForestSRC". [10]
The first European explorer to see tule elk was likely Sir Francis Drake who landed in July 1579 probably in today's Drake's Bay, Marin County, California: "The inland we found to be far different from the shoare, a goodly country and fruitful soil, stored with many blessings fit for the use of man: infinite was the company of very large and fat deer, which there we saw by thousands as we ...