From brown to white – evolution of the polar bear
Amazon.com: Polar Bear vs. Grizzly Bear (Who Would Win?): 9780545175722: Jerry Pallotta, Rob Bolster: Books
Polar Bears And Grizzlies Producing Hybrid Offspring as Arctic Melts - DER SPIEGEL
Polar bear-grizzly bear cross important to species' evolution, study finds
Brown Bears - Bears (U.S. National Park Service)
Pizzlies, Grolars – Why Hybrid Grizzly Polar Bears Aren't The Answer | Polar Bears International
Polar bear ancestors came from Ireland | Evolution | The Guardian
Polar bears, brown bears interbred during warm periods. Is it happening again? - CSMonitor.com
What Would a Cross Between a Polar Bear and a Grizzly Really Look Like? | Science| Smithsonian Magazine
Grizzly Cub and Polar Bear Form Friendship at Detroit Zoo #Shorts - YouTube
German zoo bear shot dead – DW – 03/11/2017
Brown Bears and Polar Bears and Their Tangled Histories
DNA study clarifies relationship between polar bears and brown bears
Polar bear | Description, Habitat, & Facts | Britannica
Brown bears are mating with polar bears and creating a more climate resilient hybrid animal | Daily Mail Online
Pizzly' bear hybrids are spreading across the Arctic thanks to climate change | Live Science
Polar Bear Origins Traced to a Single Bear | WIRED
Responding to Environmental Change - Bears (U.S. National Park Service)
Bears: Polar Bears, Black Bears and Grizzly Bears (Kids Can Press Wildlife Series): Hodge, Deborah, Stephens, Pat: 9781550743555: Amazon.com: Books
The Eight (8) Bear Species of the World | Bear With Us
Brolar-Bear Hybrids Could Take Over Northern Siberia, Expert Warns
Black, Grizzly and Polar Bears Now All Found in Churchill
When outdoors, stay alert and 'Bear Aware' | Bureau of Land Management
Population Genomics Reveal Recent Speciation and Rapid Evolutionary Adaptation in Polar Bears: Cell
