American Black Bear by cameron munson

introduction

Description: The American Black Bear (Ursus Americanus), is a medium-sized bear that lives only in North America. It's the smallest type of bear in the family and has very small features.

Habitat: They're very adaptable to a variety of habitats, but mainly live in one type, forested areas. Usually in cold areas full of trees.

Classifications: Mammal / Kingdom - Animal / Phylum - Chordata / Class - Mammalia / Order - Carnivora / Family - Ursidae / Genus - Ursus / Species - Americanus

Geological Time: It came to be a little less than 30 million years ago

morphological & molecular evidence

The closest relatives to the American Black Bear are:

  • Grizzly Bear
  • Polar Bear
  • Panda Bear

Some similarities they share are the claws, nails, faces, and the way they attack. The majority of their bodies are similar but they are differences such as the size of certain things like the eyes, snout, and ears.

Morphological evidence shows how this bear evolved because of the proof by other animals that share similar things. Many animals that aren't related to any type of bear have very similar structures.

homologous structures

Two other organisms that share the same structure but have different functions are wolves and anything in the feline family (cheetah, cougar, etc.)

Homologous Structures are bones / organs that are in different animals, but do not have the same function, which is proof from a common ancestor. It shows evidence of evolution for this organism because 3 animals from completely different families have the same exact bone structure, even though they all do completely different things.

An example of a vestigial structure the American Black Bear has is the "Vibrissae". Which are large, tactile hairs on the muzzle, which do no use whatsoever.

vestigial structures

Vestigial Structures are organs / bones / anything correlating to an animal that has no function at all, they show evidence for evolution because they're often homologous structures as well meaning different animals share it, therefore coming from one main thing and later descending into own families.

Very faintly, you can see little hairs on its muzzle. They're basically whiskers which have functions for other organisms such as dogs, but not for this bear.

transitional fossils

These are examples of two recent ancestor fossils of the American Black Bear. They all have similar jaws with some differences.

The American Black Bear is different in its current form now rather than before because as more and more black bears come to be, more information is shown how its bones have changed and shared characteristics of previous ancestries.

Transitional Fossils are remains of an organism that showed traits through fossils from its past ancestry to it's common descendants.

comparative embryology

Comparative Embryology proves evolution because it shows how different organisms and species started off as the same / similar embryo.

the end

Credits:

Created with images by U.S. Fish and Wildlife Service - Midwest Region - "American Black Bear Cub" • v2killer7603 - "bear zoo asiatic black bear" • cbrown1023 - "IMG_9310" • skeeze - "black bears walking wildlife" • Emertz76 - "Black bear in Smokeys"

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