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The Alaskan tundra wolf (Canis lupus tundrarum), also known as the barren-ground wolf, [3] is a North American subspecies of gray wolf native to the barren grounds of the Arctic coastal tundra region.
The tundra wolf (Canis lupus albus), also known as the Turukhan wolf, [3] is a subspecies of grey wolf native to Eurasia's tundra and forest-tundra zones from Finland to the Kamchatka Peninsula. [3] It was first described in 1792 by Robert Kerr , who described it as living around the Yenisei , and of having a highly valued pelt.
This is a list of large carnivores known to prey on humans. The order Carnivora consists of numerous mammal species specialized in eating flesh. This list does not include animal attacks on humans by domesticated species (dogs), or animals held in zoos, aquaria, circuses, private homes or other non-natural settings.
[7] [42] A more detailed glance at Finnish Lapland showed that amongst 2,062 prey items, 32.5% of the foods were Norway lemmings (though in some years the balance could range up to 58.1%), 28% were grey red-backed voles (Myodes rufocanus) and 12.6% were tundra voles, with birds constituting a very small amount of the prey balance (1.1%). [168]
The rough-skinned newt is capable of growing up to 26.1 centimeters and will typically reach at least 12.7 centimeters. The newt's name comes from the granular and rough texture on their skin. The skin on the newt is toxic and releases a powerful neurotoxin called Tetrodotoxin, which can effect mucous glands and skin.
In 2021, the People's Trust for Endangered Species funded a survey of mountain hare populations in the UK's Peak District after concerns about the viability of the isolated population, believed to be as low as 2,500. The trust believes climate change is a threat to long-term survival of the Peak District population, which was introduced to the ...
While TTX is mainly located in the glands of the skin, the rough-skinned newt, as well as some other amphibians also possesses TTX in the ovaries and eggs. The higher the skin toxin levels were in the female, the higher the toxin level found in the egg. This is evidence that high toxin levels of the skin may, in fact, be under indirect selection.
Large prey may prove troublesome for a predator, while small prey might prove hard to find and in any case provide less of a reward. This has led to a correlation between the size of predators and their prey. Size may also act as a refuge for large prey. For example, adult elephants are relatively safe from predation by lions, but juveniles are ...