8 of 8: Boone, a 9-year-old grey seal at Brookfield Zoo, eyes his heart-shaped ice treats that he received for Valentines Day. 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. (Photo/Jim Schulz/Chicago Zoological Society)

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