Nimravidae

These animals looked like cats.

They lived a long time ago. Some had long, sharp teeth. They were not real cats. People call them "false saber-tooths."

Some were small like a bobcat.

Other ones were very large. Some were as big as a lion. They had strong bodies. They had short legs and tails.

These animals lived in many lands. They lived in North America and Africa. They also lived in Asia.

They are all gone now. They lived in warm, wet forests. These animals were very interesting.

Nimravids were a family of meat-eating animals. Many people call them "false saber-tooths." They looked like cats, but they were not true cats. They belong to a group called Feliformia. This is a group of animals that includes modern cats.

These animals came in many sizes. Some were small like a bobcat. Others were as large as a jaguar or a lion. Some were even bigger. They had strong, cat-like bodies. Most had short legs and short tails. Their teeth were also very different. Some had long, sharp teeth called canines. These teeth helped them hunt. Other nimravids had smaller teeth, just like modern cats.

Nimravids lived in North America, Africa, and Eurasia. They first appeared in Asia a long time ago. They liked to live in forests. As the world grew drier, the forests changed to open woods. This helped the nimravids thrive. Eventually, they went extinct. In North America, their disappearance led to a "cat gap." This was a time when no cat-like hunters lived there for 7 million years.

Nimravids were a group of meat-eating animals from long ago. Many people call them "false saber-tooth cats." This is because they looked like famous saber-toothed cats, but they were not part of that family. They are also not true cats like the ones we see today. Instead, they belong to a group called Feliformia. This group includes many animals that are related to modern cats.

Scientists study them to learn how different hunters evolved.

These animals had many different ways of living and hunting. Most nimravids had muscular bodies that were low to the ground. They usually had shorter legs and shorter tails than modern cats. Their feet were also different because they walked on the flat of their feet. Some nimravids had very large, flat teeth called canines. These teeth were used for hunting. Other nimravids had smaller teeth that looked more like modern cats.

Some were ambush hunters, while others might have chased their prey.

People have been studying these fossils for a long time. An American scientist named Edward Drinker Cope named the family in 1880. He used the name Nimravus for the first type of this animal. Since then, many other scientists have worked to group them correctly. They have moved them between different scientific categories over many years. Some experts even argued about whether a group called barbourofelines belonged in the family.

Most experts now believe they are part of the nimravid family again.

Nimravids came in many different sizes and lived in many places. Some were small, like the tiny Maofelis. Others, like Hoplophoneus, were about the size of a leopard. Some were as large as jaguars or small lions. The biggest ones, like Barbourofelis fricki, were even larger than that. They lived in North America, Africa, and Eurasia. They first appeared in Asia during the Middle Eocene period.

These animals lived through big changes in the Earth. At first, the world was warm and very wet with many forests. As the climate became cooler and drier, the forests turned into open woodlands. This change helped the nimravids flourish for a while. Eventually, they went extinct for different reasons in different places. In North America, their disappearance caused a "cat gap." This was a time of 7 million years when no cat-like predators lived there.

Nimravidae is an extinct family of carnivorans known as "false saber-toothed cats." While they resemble true cats, they do not belong to the family Felidae. Instead, they are a distinct family within the suborder Feliformia. This group includes many animals related to modern cats. Nimravids were highly successful predators that lived across North America, Africa, and Eurasia. They occupied many different ecological roles for millions of years. Understanding them helps scientists learn how similar body shapes can evolve independently.

Most nimravids possessed muscular, low-slung bodies. They typically had shorter legs and shorter tails than modern cats. Their feet were also different from current felids. They walked in a plantigrade or semiplantigrade posture. This means they walked on the flat of their feet rather than on their toes. Their ear structure also differed from true cats. While modern cats have an auditory bulla with a septum, nimravids had ossified bullae without a septum. Scientists assume they had a cartilaginous housing for their ear mechanisms instead.

The family displayed a wide variety of tooth shapes and sizes. Some nimravids evolved massive, flattened upper canines. These animals often had a downward-projecting flange on the mandible. This bony part on the lower jaw was as long as the canine teeth. Other nimravids had smaller canines similar to modern cats. Some had intermediate teeth between these two styles. Because of these differences, nimravids are often called "false saber-tooths." They evolved these traits through parallel evolution rather than sharing a direct ancestor with true saber-toothed cats.

Nimravids came in many different sizes. Some species, like Eusmilus bidentatus and Nanosmilus, were only the size of a small bobcat. Others, such as Barbourofelis morrisi and Hoplophoneus occidentalis, were leopard-sized. Some were as large as jaguars or small lions. The largest members, including Quercylurus and Barbourofelis fricki, reached even greater sizes. These variations allowed them to fill many different roles in their environments. They could be ambush predators or pounce-pursuit predators. Some, like Albanosmilus whitfordi, may have been cursorial predators.

The history of naming this family involves many scientists. American paleontologist Edward Drinker Cope named the family Nimravidae in 1880. He used Nimravus as the type genus.

Over the years, the classification of nimravids has changed frequently. They were assigned to different groups like Fissipedia, Caniformia, and Aeluroidea. In 2004, the barbourofelines were moved to their own family. However, most experts have since returned them to the Nimravidae family. A 2021 study even suggests barbourofelines might be part of the Nimravinae subfamily.

Nimravids first appeared during the Middle Eocene in Asia. Some of the earliest members were Maofelis and Pangurban.

During this time, the Earth was warm and wet with lush forests. As the climate became cooler and drier, forests turned into open woodlands. This change helped nimravids flourish during the Oligocene. Their rise in size and diversity coincided with the extinction of the oxyaenids. This event opened a niche for cat-like carnivores. Nimravids eventually moved into Europe and Africa as well.

The extinction of the family happened in stages. The hoplophonines died out around 29.5 million years ago. The nimravines went extinct around 25.9 million years ago. In North America, their disappearance caused a "cat gap." This was a 7 million year period with no cat-like predators in the region. The barbourofelines survived longer, until about 7 million years ago. Some scientists suggest they competed with machairodonts. Others believe they went extinct due to the expansion of grasslands during the Late Miocene.