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Associated Press
In this Feb. 12, 2013 photo provided by the Chicago Zoological Society, grey seals Tasha, 9, left, and Boone, 9, give their seal of approval for the heart-shaped gelatin and ice treats they received for Valentine?s Day at the Brookfield Zoo in Brookfield, Ill. The Animal Programs staff for the Chicago Zoological Society is always thinking of ways to physically and mentally stimulate the animals at Brookfield Zoo. One way is by providing them with a variety of different enrichment and food items they normally do not receive on a regular basis. (AP Photo/Chicago Zoological Society, Jim Schulz)

Grey seals Tasha, 9, left, and Boone, 9, nuzzle behind the heart-shaped gelatin and ice treats they received for Valentine's Day at the Brookfield Zoo in Brookfield, Ill. The Animal Programs staff for the Chicago Zoological Society is always thinking of ways to physically and mentally stimulate the animals. One way is by providing them with a variety of different enrichment and food items they normally do not receive on a regular basis.