The bear in this vid, however, seems to be more interested in an elk and her calves. We hear the distressed calls of some adult elks and a calf as they run towards a raised viewing area and walkway. At first, it is not easy to see what is causing the panic but then you can catch sight of a bear pursuing them. The grizzly is slowed down a little as they slip into the river but they soon recover and carry on the rampage. There is a worrying moment when the bear sees the group of humans and pauses – perhaps weighing up whether they are a threat or a potential meal! But, soon the elk chase is back on and the bear bounds over the walkway to continue the chase.

Elk and Their Predators

There are more elk than any other large mammal in Yellowstone and they are an important part of the ecosystem. In the summer, it is estimated that there are between 10,000 and 20,000 in the park in six to seven herds. As well as providing a source of meat for bears, as we see here, they are hunted by mountain lions and wolves. They are also an important source of food for scavengers such as bald eagles and coyotes. Elk are large herbivores and can consume up to 20 pounds of vegetation each day. They are also fast – an adult male can run at up to 40mph. Calves, however, are not as fast and are therefore more likely to get attacked by bears and other predators.

Elk Behaviour

When they are not getting chased by bears, elk are usually eating. An elk has a four-chambered stomach and grazes grass in the morning and in the evening. Then, they rest in a sheltered place as they digest it. Their diet includes native grasses all year round but they will also eat tree bark in the winter, and nibble on tree sprouts in the summer. They are social animals who live in groups of up to 400 individuals. Usually, adult males and females live separately and the female groups tend to be larger. Adult males will also sometimes live alone. Female herds can also include young or old bulls who are not aggressive. The elk we see here may have become separated from their larger group. Hopefully, they were soon reunited!

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