This otter is significant because he is the third otter found in the Chicago area in the last year.
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"It's an indication that the habitat has improved and that our environment is going in the right direction," said Chris Anchor, a wildlife biologist with the Cook County Forest Preserve.
The otter - a North American river otter -- was released at Crabtree Nature Center in northwest suburban Barrington where it was recently captured.
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Veterinarians at the Brookfield Zoo implanted the monitoring chip.