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Hudson, a 2-year-old Polar Bear devours a pumpkin at the Chicago Zoological Society's Brookfield Zoo in Brookfield, Ill. on Wednesday, Oct. 28, 2009. With Halloween nearing, several of the animals, including lions, tigers, polar bears, brown bears, and gorillas were given pumpkins to enjoy and play with as part of the zoo-wide behavioral enrichment program. (AP Photo/M. Spencer Green)

White Rhinoceroses check out the pumpkins at the Detroit Zoo in Royal Oak on Wednesday, Oct. 28, 2009. (Info from request: Animals at the Detroit Zoo play with pumpkins as a Halloween treat on Wednesday, Oct. 28, 2009. (AP Photo/Detroit Free Press, Detroit Free Press) ** DETROIT NEWS OUT **

A Lion Country Safari chimpanzee holds a Halloween pumpkin filled with treats, Thursday, Oct. 29, 2009, in Loxahatchee, Fla. The park's lions, chimps and elephants were given special Halloween treats and enrichment items Thursday in advance of Halloween on Saturday when the park will offer special events to visitors. (AP Photo/The South Florida Sun-Sentinel, Mark Randall)

Whirl, a 2-and-a-half-year-old Amur Tiger carries a pumpkin at Chicago Zoological Society's Brookfield Zoo in Brookfield, Ill. on Wednesday, Oct. 28, 2009. With the Halloween season upon us, several of the animals, including lions, tigers, polar bears, brown bears, and the gorillas, were given pumpkins to enjoy and play with as part of the zoowide behavioral enrichment program. (AP Photo/M. Spencer Green)

In this photo released by the Wildlife Conservation Society, Darwin, a young rock wallaby, perches on a rock near a jack-o-lantern, at the Prospect Park Zoo in New York, Wednesday, Oct. 28, 2009. Rock wallabies are native to South Australia and New South Wales. (AP Photo/WCS, Julie Larsen Maher)

Nadaya, an 8 year-old Western Lowland Gorilla enjoys a pumpkin at Chicago Zoological Scociety's Brookfield Zoo in Brookfield, Ill. With the Halloween season upon us, several of the animals, including lions, tigers, polar bears, brown bears, and the gorillas, were given pumpkins to enjoy and play with as part of the zoowide behavioral enrichment program. (AP Photo/M. Spencer Green)

A female lion at Lion Country Safari growls at a pumpkin, Thursday, Oct. 29, 2009, in Loxahatchee, Fla., before eating the meat hidden inside. The park's lions, chimps and elephants were given special Halloween treats and enrichment items Thursday in advance of Halloween on Saturday when the park will offer special events to visitors. (AP Photo/South Florida Sun-Sentinel, Mark Randall)

Chip, a 13-year-old Western Lowland Gorilla, snacks on spaghetti (dyed red) taken from inside a pumpkin at the Detroit Zoo in Royal Oak, Mich. on Wednesday, Oct. 28, 2009. (AP Photo/Detroit Free Press, Patricia Beck)

Axhi, a 14-year-old Grizzly bear devours a pumpkin at the Chicago Zoological Society's Brookfield Zoo in Brookfield, Ill. on Wednesday, Oct. 28, 2009. With the Halloween season nearing, several of the animals, including lions, tigers, polar bears, brown bears and gorillas were given pumpkins to enjoy and play with as part of the zoo-wide behavioral enrichment program. (AP Photo/M. Spencer Green)

Whirl, a 2-and-a-half-year-old Amur Tiger chases a pumpkin at Chicago Zoological Society's Brookfield Zoo in Brookfield, Ill. on Wednesday, Oct. 28, 2009. With the Halloween season nearing, several of the animals, including lions, tigers, polar bears, brown bears, and the gorillas, were given pumpkins to enjoy and play with as part of the zoowide behavioral enrichment program. (AP Photo/M. Spencer Green)

Axhi, a 14-year-old Grizzly bear devours a pumpkin at the Chicago Zoological Society's Brookfield Zoo in Brookfield, Ill. on Wednesday, Oct. 28, 2009. With the Halloween season nearing, several of the animals, including lions, tigers, polar bears, brown bears and gorillas were given pumpkins to enjoy and play with as part of the zoo-wide behavioral enrichment program. (AP Photo/M. Spencer Green)

Whirl, a 2-and-a-half-year-old Amur Tiger chases a pumpkin at Chicago Zoological Society's Brookfield Zoo in Brookfield, Ill. on Wednesday, Oct. 28, 2009. With the Halloween season upon us, several of the animals, including lions, tigers, polar bears, brown bears, and the gorillas, were given pumpkins to enjoy and play with as part of the zoowide behavioral enrichment program. (AP Photo/M. Spencer Green)