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.