Hyena

Hyenas are special animals.

They live in Africa and Eurasia. Some hyenas are built like dogs. They can run very fast.

Other hyenas are built to crush bones. They eat food very quickly.

One small hyena eats tiny bugs. This is called an aardwolf. It is the only dog-like hyena left. Hyenas are very important to the land.

Hyenas are unique animals. They belong to the family Hyaenidae. There are only four types left today. These are the striped hyena, the brown hyena, the spotted hyena, and the aardwolf.

Long ago, hyenas were different. They lived in jungles 22 million years ago. Some early hyenas were thin and looked like civets. Later, they split into two groups. One group was dog-like and very fast. The other group was built to crush bones.

Most dog-like hyenas died out. Only the aardwolf survived. The aardwolf is small. It eats termites, which are tiny insects.

The bone-crushing hyenas stayed strong. They became top scavengers. Scavengers are animals that eat meat left by others.

Spotted hyenas are very social. This means they live in teams. They hunt in packs to find food. They also have strong teeth. These teeth help them eat quickly. Hyenas are a vital part of the wild. They help keep nature in balance.

Hyenas are very important members of many African ecosystems. They belong to a family called Hyaenidae. There are only four species living in the world today. These are the striped hyena, the brown hyena, the spotted hyena, and the aardwolf.

Even though they are a small family, they play a huge role in nature. They help keep the environment healthy by cleaning up. Many human cultures have stories about them in their folklore. Some people even find them frightening in old myths.

Hyenas have a very interesting way they work. They are built to be great runners and hunters. They have calloused feet and large, blunt claws. These claws do not retract like a cat's claws do. Instead, they help the hyena run and make sharp turns. Most hyenas use their teeth to catch prey. They also eat their food very quickly. Some species might even store their food for later.

The history of hyenas began a long time ago. They first appeared in the jungles of Eurasia 22 million years ago.

The very first ancestors were likely small and looked like civets. A species called Plioviverrops lived about 20 to 22 million years ago. Over time, hyenas split into two different types. One type was lightly built and looked like dogs. The other type was robust and built to crush bones. This split happened between 10 and 14 million years ago.

Many different species lived in the past. For a long time, dog-like hyenas were very common. One species, Ictitherium viverrinum, looked much like a jackal. There were more than 30 species of these dog-like hyenas. Most of them died out 5 to 7 million years ago. This happened because the climate changed. Also, canids began moving into their areas. One hyena, Chasmaporthetes ossifragus, even crossed into North America. It became a fast sprinter like a cheetah.

Today, we can see how these animals are related to others. The spotted hyena is a very social animal. It lives in teams and hunts in packs.

The aardwolf is the only survivor of the dog-like group. It is quite small and eats termites. This is a very different diet than the bone-crushing hyenas. The bone-crushers use strong teeth to eat large animals. This is similar to how some dogs or cats eat. All these different ways of living help hyenas survive in the wild.

Hyenas are specialized mammals belonging to the family Hyaenidae. They are feliforms, which means they are more closely related to cats than to dogs. However, they show many traits similar to canids due to convergent evolution. This process happens when different animals develop similar features because they live in similar ways. For example, both hyenas and canines are cursorial hunters. This means they are built for running long distances. They also use their teeth rather than claws to catch prey. Hyenas are vital components of many African ecosystems.

The physical design of a hyena is built for movement and eating. They have calloused feet and large, blunt, nonretractable claws. These claws do not pull in like a cat's claws. Instead, they help the animal run and make sharp turns. Hyenas are also known to eat their food very quickly. Some species may even store food to eat later. While they look like dogs when hunting, their social behaviors are different. Their grooming, scent marking, and mating habits are actually consistent with other feliforms.

Hyena history began in the jungles of Miocene Eurasia about 22 million years ago. The earliest ancestors were likely small and lived in trees. One of the first known species was Plioviverrops, which lived 20 to 22 million years ago. It was a lithe animal that looked similar to a modern civet. Over millions of years, the lineage changed. Descendants developed longer legs and more pointed jaws. Eventually, the family split into two distinct groups. One group consisted of lightly built, dog-like hyenas. The other group consisted of robust, bone-crushing hyenas.

The dog-like hyenas were very successful for a long time. About 15 million years ago, they reached a peak with over 30 identified species. One species, Ictitherium viverrinum, was very similar to a jackal. In some fossil sites, these animals outnumbered all other carnivores combined. However, their numbers declined 5 to 7 million years ago. This was caused by climate change and the arrival of canids. Most dog-like hyenas died out by 1.5 million years ago. One exception was Chasmaporthetes ossifragus, which crossed into North America. It survived by becoming a fast sprinter, much like a cheetah.

The bone-crushing hyenas took a different path. They became the dominant scavengers of Eurasia and Africa. Between 10 and 14 million years ago, they began to rise as the dog-like group declined. One massive genus, Pachycrocuta, was a mega-scavenger. It was strong enough to splinter the bones of elephants. Eventually, Pachycrocuta was replaced by smaller species like Crocuta and Hyena. This change may have been linked to the Mid-Pleistocene transition. These bone-crushing specialists filled the role of cleaning up large animal carcasses.

There are only four species of hyena alive today. The spotted hyena, or Crocuta crocuta, is a highly social pack hunter. It diverged from other hyenas about 10 million years ago. Spotted hyenas developed sharp carnassial teeth to help them hunt. This allowed them to hunt live prey instead of just scavenging. The other three species are the striped hyena, the brown hyena, and the aardwolf.

The aardwolf is unique because it is the only surviving dog-like hyena. It is an insectivore, meaning it eats insects. It survives by eating massive amounts of termites. This diet helped it avoid competition with the arriving canids.

Modern science uses genetics to understand how these animals changed. Researchers have found that all four living species have an expanded olfactory receptor gene family. This helps them with their specialized feeding habits. The spotted, striped, and brown hyenas also have expanded immune-related genes. This likely helps them stay healthy while scavenging. In aardwolves, specific genes help them handle toxins. This allows them to eat termites that produce chemical defenses. These genetic changes show how hyenas have perfectly adapted to their specific environments.