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http://www.livescience.com/27335-giant-pandas.html

http://www.livescience.com/27436-polar-bear-facts.html

http://www.theanimalspot.com/sunbear.htm

http://www.kidzone.ws/lw/bears/facts-sunbear.htm

http://www.bioexpedition.com/sun-bear/

http://animaldiversity.org/accounts/Ursidae/

http://www.nhc.ed.ac.uk/index.php?page=493.172.289

http://www.crystalinks.com/fossilbear.html

http://www.fossilmall.com/EDCOPE_Enterprises/vertebrates/vfossil31/vertebrate-fossil-31.htm

http://www.lynxeds.com/hmw/plate/family-ursidae-bears

https://a-z-animals.com/animals/giant-panda-bear/

https://a-z-animals.com/animals/sun-bear/

https://seaworld.org/en/animal-info/animal-infobooks/polar-bears/physical-characteristics

http://news.ucsc.edu/2013/03/polar-bear-genomics.html

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One of Darwin's theories states, "Descent with Modification." This is true for my taxonomic group because each species in this group have different characteristics and adapted trait, which they developed over time, to ,survive in their environment.
Darwin's other theory deals with the types of natural selection provided in a family. As for bears, they show more of a disruptive natural selection because, traits and characteristics appear with specific animals to help them in their specific environment.

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There has been a recent discovery of how brown bears and polar bear are related. A," population of polar bears was stranded by the receding ice on a few islands in southeastern Alaska. Male brown bears swam across to the islands from the Alaskan mainland and mated with female polar bears, eventually transforming the polar bear population into brown bears." Also their offspring was fertile. "The findings, published March 14 in PLOS Genetics, upend prevailing ideas about the evolutionary history of the two species, which are closely related and known to produce fertile hybrids."

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Not only do all animals look alike. They also have similar function. One thing that is very unique within the Ursidae family in their jaws. All their jaws are extremely strong to eat their prey.

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Giant Panda

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Throughout the taxonomies provided for all three species, people can see that each animal has extreme similarities between one another. They are all similar from Kingdom to Family to how the relatedness through the animals.

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Kingdom: | Animalia
Phylum: | Chordata
Class: | Mammalia
Order: | Carnivora
Family: | Ursidae
Genus: | Helarctos
Species: | H. malayanus

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Kingdom: | Animalia
Phylum: | Chordata
Class: | Mammalia
Order: | Carnivora
Family: | Ursidae
Genus: | Ursus
Species: | maritimus

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Kingdom: | Animalia
Phylum: | Chordata
Class: | Mammalia
Order: | Carnivora
Family: | Ursidae
Genus: | Ailuropoda
Species: | A. melanoleuca

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Throughout all the evidence and characteristic about the relatedness and evolution shows through it showing the gradual equilibrium that has been shown in the Ursidae Family.  This is from the gradual separation of the family and the different areas we see today. This is also from shown through the divergent evolution from the polar bear and the brown bear when they had healthy offspring. Overall, the separation of the family concludes fro migration and emigration dude to all the different locations throughout the species. From tropical rain forest to snowy and cold tundras. Another reason on how evolution is shown is due to random mating. Such as the polar bear and brown bear. As a result they made healthy offspring to show that they are related to one another.

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The tooth of a Giant Short-Faced bear from the Pleistocene time period.
The length of this between 8-11 inches.

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The head of a "Cave Bear" also during the Pleistocene time period
(younger bear).

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Found in the Ural mountain of Russia.
Lived in the Pleistocene time period. Ancestor of a cave bear.

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Found on the Norwegian Coast cliff
Dated to be between 110,000 to 130,000 years old. An ancestor of a polar bear.

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The "Pygmy", an ancestor to the Giant Panda.
Lived around 2 to 3 million years ago. It lived in southern China.

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The Giant Short-Faced bear. It was found in South America. It weighed around 3,500 pounds and was 11 feet tall.
was here in the Pleistocene time period.

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Polar Bear

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"The bear family is one of five families of dog-like mammals descended from the wolf-like Vulperines."

The animals from the Ursidae family also show evolution from the different habitats they live in and how they have developed due to them.

Such as, the Giant Panda, eating bamboo all day in the hotter weather to the polar bear hunting all day to find food in the arctic.

Also the animals in the family share a similar figure in the why their characteristics show.

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They share a common characteristic which includes body traits. All bears have fur, walk on all fours, paws for feet, and a narrower face. All bears also have long, curved claws for hunting and climbing.

"Bears are omnivorous and opportunistic." When it comes to hunting, bears eat whatever is possible to survive. Bears share the same type of personality. Isolated and alone. Bears usually like to be by themselves, unless they are with cubs, they feel more comfortable and happy that way.

All bear skull's are "elongated" (length and height of their head are equivalent to one another) and have extremely power molars for their diet of plants and animals. Bears also have an bigger and muscular body for quickness and swiftness for when they need to catch prey and fend of competitors.

Bears usually live in caves or can climb tress, if necessary (either for protection, food, shelter, etc..). Some also have the ability to swim.

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Location: Southeast Asia (Cambodia, Laos, Vietnam, Myanmar, Thailand, Peninsular Malaysia, ans islands of Borneo, Sumatra, and Java Eastern India)

Habitat : Tropical Rain forest

"spend a lot of time in trees." (arboreal)

Shelter: Climbing up trees

Characteristics: Smaller out of the Ursidae species. They are usually between four feet in length. They weigh around 100 pounds. "Black fur with an orange-yellow horseshoe shape of color on their chest." They also have long-curved claws for climbing.

Behavior: Majority of their time is spent climbing trees or eating honey. They also like to bath in the sun. And they usually hunt at night. They do not need to hibernate because of the warm temperature at which they live in.

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Location: China

"Remote, mountainous regions of Central China, in Sichuan, Shaanxi, and Gansu providence." anda's are located wherever wet bamboo in an open area is located.

Shelter: "Makes dens from hollowed-out logs or stumps of trees found within forests"

Characteristics: Mix of black and white spots around the entire body. They are smaller height wise yet bigger length wise. Giant Pandas are usually around four to five feet but weight around 300 pounds.

Behavior: Giant Pandas are individual animals that like to b by themselves. And unless it is mating season.

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Location: Cold climate areas (temperature of -29 degrees or lower) such as-

Canada

Russia

US (Alaska)

Greenland

Norway

Shelter: Snow dens however, Polar Bears do not usually hibernate

Characteristics: The Polar Bear is the largest species for the bear family. The Polar Bear is over 10 feet on its hind legs (3.5 to 5 feet on all fours). Males usually weigh between 775 to 1,200 pounds and females are between 330 to 650 pounds. Their hair is usually white to blend in with their surrounds when hunting.

Behavior: Polar Bears are very solitary and like to travel by themselves. And when they hunt they, "still-hunt", or waiting for their prey and are very careful.