Polar bears, brown bears interbred during warm periods. Is it happening again? - CSMonitor.com
Hybrid 'Brolar Bears' Could Spread Through The Arctic as The Planet Warms : ScienceAlert
Pizzly' bear hybrids are spreading across the Arctic thanks to climate change | Live Science
Amazon.com: Polar Bear vs. Grizzly Bear (Who Would Win?): 9780545175722: Jerry Pallotta, Rob Bolster: Books
Bears: Polar Bears, Black Bears and Grizzly Bears (Kids Can Press Wildlife Series): Hodge, Deborah, Stephens, Pat: 9781550743555: Amazon.com: Books
Polar Bear Origins Traced to a Single Bear | WIRED
DNA study clarifies relationship between polar bears and brown bears
Polar Bears And Grizzlies Producing Hybrid Offspring as Arctic Melts - DER SPIEGEL
The Eight (8) Bear Species of the World | Bear With Us
When outdoors, stay alert and 'Bear Aware' | Bureau of Land Management
TIME for Kids | Compare the Bears
:max_bytes(150000):strip_icc():focal(779x666:781x668)/orphaned-grizzly-1-2000-822824d0d3064530810da36e749431c8.jpg "Grizzly Bear and Polar Bear Cub Become Best Friends at Detroit Zoo")
Grizzly Bear and Polar Bear Cub Become Best Friends at Detroit Zoo
Population Genomics Reveal Recent Speciation and Rapid Evolutionary Adaptation in Polar Bears: Cell
German zoo bear shot dead – DW – 03/11/2017
Brown Bears and Polar Bears and Their Tangled Histories
Brolar-Bear Hybrids Could Take Over Northern Siberia, Expert Warns
We found grizzly, black and polar bears together for the first time | PBS NewsHour
Responding to Environmental Change - Bears (U.S. National Park Service)
Pizzlies, Grolars – Why Hybrid Grizzly Polar Bears Aren't The Answer | Polar Bears International
Grizzly, polar bear cubs find friendship at the Detroit Zoo
From brown to white – evolution of the polar bear
Polar bear ancestors came from Ireland | Evolution | The Guardian
What Would a Cross Between a Polar Bear and a Grizzly Really Look Like? | Science| Smithsonian Magazine
Grizzly–polar bear hybrid - Wikipedia
