Timber wolf: a wolf with gray fur that lives in northern North America, also called the gray wolf.
They weigh 40-175 pounds
Fur can be different colors (black, white, red)
Habitat: Their main habitat is known to be cold climates, but they can live anywhere.
They mostly live far away from humans.
Classification: Timber wolves are classified as Canis lupus in the animal kingdom. They are carnivores of the canid family.
Timber wolves have been around for about 750,000 years.
Relatives: timber wolves have many relatives, including foxes, jackals, coyotes, and dogs.
Jackals, dogs, and coyotes have long ears and bushy tails, just like the timber wolf.
Molecular similarities: Dogs and wolves DNA is very similar, with only a 0.2% difference. Both of these animals share a common ancestor from about 2 million years ago.
Molecular evidence shows that wolves and dogs have similar DNA and similar features, like pointed ears and bushy tails. This proves they came from a common ancestor who had pointy ears.
Humans, birds and whales all have homologous structures with a wolf.
Humans and dogs like wolves have a similar skeleton.
Humans, dogs, birds, and whales all have similar bones.
Homologous structures are bones in an animal that are similar to another animal, but function differently. For example, humans and wolves have very similar leg bones, but humans don't need to walk on four legs, while wolves need four legs to live properly in their environment.
A wolf's only vestigial structure is the dewclaw, which is a claw that is above the paw. It is too high up to be useful.
A vestigial structure is a part if an animal that is not needed anymore. They can show evidence for evolution by showing us parts of the animal that its ancestor might have needed, but its species grew out of over time.
Letter D is the dewclaw in the picture.
Skeleton of a creodonta, an ancestor to carnivores.
Miacis, which was an ancestor for dogs, weasels and raccoons.
Wolves today are different from creodonta and miacis' because they now have longer legs, and their tails are more bushy.
Transitional fossils are fossils that show the in between stages of an animal's evolution. They show evidence for evolution because they show how an animal evolved over the years.
Comparative embryology is comparing an animal's growth with another animal's and seeing if it looks the same. This can be used as evidence to see if they came from a common ancestor.