The wolves pace back and forth in their chain-link pens, wagging their tails, jumping and rattling the metal with their paws. They cast furtive glances at the zookeepers.
It's carcass day.
When the gates open, the six canines dash for the meat in the snowy enclosure. A 115-pound black wolf, Denali, goes for the biggest prize -- a mass of bones and flesh. A skinnier, skittish one, Ruby, lets the others go first then settles for a small piece. All grab their chunks of caribou, moose and deer and start to rip.
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