What do badgers eat?
Badgers are mostly carnivorous, like other members of the weasel family. They feed mainly on small mammals such as groundhogs (also known as woodchucks or gophers), chipmunks, squirrels, voles, and mice. However they are fairly opportunistic in their choice of prey and may eat small reptiles and amphibians, bird's eggs, insects, and likely carrion (such as road-kill). They don't seem to have the taste for garbage that raccoons and skunks do and tend to stay farther from populated areas, though individual badgers will likely eat human food if it is accessible.
Badgers are well known for their ability to hunt burrowing mammals, particularly in the West, where colonial ground squirrels are quite common. They can dig incredibly fast in pursuit of prey and often enlarge the burrows of the animals they hunt faster than their prey can escape. They have even been observed plugging one entrance while digging into an alternate entrance to corner a prey animal!
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reproduction
Badgers typically mate in the late summer and early fall. However, because of a process called "delayed implantation", the embryo does not start to develop until sometime in the winter. The young (called kits) are born in a burrow in the early spring and the litter size is between 1 and 5. The young are born blind and helpless, and spend the first month or two of their lives inside the burrow. By the end of the summer, the young are independent of their mother (the males have no part in the rearing of young) and usually disperse out on their own. Though badgers can live longer in captivity, a wild badger is quite old at 10.
behaviour
Badgers are mostly nocturnal, preferring to do most of their hunting and moving around at night. Though they can occasionally be seen during the day as well, particularly where human activity is low, they usually spend the day sleeping underground in a burrow.
They are a very nomadic animal, and may spend just a few days and nights in an area before moving on. So instead of having one central location for a den like many other animals, they can have several dozen throughout their home range. Sometimes they return to an old burrow, and other times they will simply dig a new one. The size of their territories is largely dependant on the available food and can therefore be quite variable. Territories have been recorded as large as 300 square kilometers, though most are much smaller. In general, males have larger home ranges than females, and a male's home range may overlap with that of more than one female.
Despite their relatively slow speed above ground, they can cover great distances when they want to. One particular badger in BC was found to travel almost 14 kilometers in 4 hours! Other research projects have shown them to commonly travel 10 kilometers a night, though usually their nightly movements are much less than that. Surprisingly, badgers are excellent swimmers, and they have been observed crossing even large rivers with ease.
They don't actually hibernate in the winter, but will often go into periods of reduced activity where they may stay in a burrow for several days, especially during very cold spells. How active they remain in southern Ontario's relatively mild winters is unknown.
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Predators and threats
Adult badgers are relatively free from natural predators in Ontario, though coyotes and even large farm dogs may target young and very old badgers. While badgers are much more intelligent around roads than raccoons or skunks, vehicles are probably the biggest cause of premature death for badgers. Badgers are still trapped for their fur in some parts of North America, but it is not particularly valuable or in demand (shaving brushes were one of its main uses). In the West, animals like wolves and cougars are significant predators of badgers, and deliberate persecution by humans can be a major issue.
Badgers have quite a reputation for being aggressive and even dangerous. While there is some truth to these tales, there is much more exaggeration. A groundhog is about the biggest animal a badger would attack for food and badgers are usually quite shy and prefer not to be seen. But like any animal, a badger will defend itself if it feels its life is in danger or if it is protecting its young. Badgers cannot run as fast as other larger animals and have little hope of even outrunning a quickly jogging person. If they cannot get underground quickly enough, they rely on their exceptionally bold and fearless nature to deter large threats, making themselves seem too dangerous to be worth the risk. However, even a medium-sized dog poses a threat that a badger will do its best to get away from and people have little to fear provided they respect a badger's space.
Vehicles are likely the primary cause of premature death for badgers in Ontario
Shaving brushes provided the main demand for badger fur and trapping
This well-circulated picture from the internet shows a defensive badger doing an excellent job of looking threatening. (Click for more links on badger ecology)
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