A Mystery in Alaska: Introduction - Steller's Sea Lions, PBS Nature Series, "Steller's sea lions are rapidly disappearing from Alaska's waters, and no one knows why. A broad combination of factors

Bearded Seal, NatureWorks, New Hampshire Public Television, Image Credits: Clipart.com unless otherwise noted, Visit the website for photos and to learn about its characteristics, range, habitat

Bearded Seal, Office of Protected Resources, NOAA Fisheries Services, Photo, physical description, and information on its habitat, distribution, threats, and more.

Bearded Seal - Erignathus barbatus, By Anthony Neuberger; Laurel Popplewell; Hillary Richardson, Animal Diversity Web, University of Michigan Museum of Zoology, Visit the website to learn about

Bearded Seal: CalPhotos, University of California, Berkley, Click on the thumbnail to see an enlargement

Beluga Whale, Enchanted learning, Labeled illustration and information for younger students.

Beluga Whale Video Clip 1, Posted by StorytellerMedia, YouTube.com, Video lengthy: 02:08.

Beluga Whales, SeaWorld.org, Everything you want or need to know about Beluga whales can be found here. Use the menu on the left side to learn about their habitat, adaptation, behavior, diet & fee

For Hudson Bay Polar Bears, The End is Already in Sight, July 8, 2010, Interview with Andrew E. Derocher, University of Alberta, Environmental 360, Yale School of Forestry & Environmental Studies,

Harp Seal, Wikipedia.org, Visit the website for article and photos (click to enlarge).

Humpback Whale: Hunting Technique, Posted by Apexpredator11, June 06, 2007, YouTube, Video length: 02:09. Wow!!

Killer Whale, Wikipedia.org, Visit the website for an article and photos (click to enlarge).

Polar bear eaten by shark: who's top predator?, By Alister Doyle, Environment Correspondent, August 11, 2008, Reuters.com, Did the shark kill the polar bear or was it scavenging leftovers?

Polar Bears - World's Largest Land Predators, Athropolis.com, How much can a polar bear consume in one meal? And what is their favorite food? Find out here.

Polar Bears on Thin Ice, by Lisa Gardiner, Windows to the Universe, University Corporation for Atmospheric Research (UCAR), Will the polar bear be added to the endangered species list? Learn mor

The Arctic Food Chain: Mercury and Polar Bears, The Polar Field Service Newsletter, Polar bears have been found to get their food from two primary food webs - phytoplankton and ice algae. Which on

Walrus Printout, EnchantedLearning.com, Labeled illustration and information for younger students.

What Top Predators Can Tell Us About Ocean Ecosystems ScienceDaily.com June 7, 2011 "It just takes a pinch. But from a sample of animal fat, Sara Iverson can determine what predators at the top