This otter is significant because he is the third otter found in the Chicago area in the last year.
"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.
Veterinarians at the Brookfield Zoo implanted the monitoring chip.