"It was just a matter of finding him", Robb told NBC 2 during a news conference.
After days of searching, the area around the lagoon was closed Monday in the hopes that the quiet would help lure the animal out of hiding. That's when Robb says he saw the gator's eyes shine in the darkness.
Gandurski said the city deals with about one alligator-related incident every year, but it's rare to have to deal with them in the wild.
It took Robb roughly eight trips around the lagoon before he got a glimpse of the alligator.
Robb, the owner of Crocodilian Specialist Services in St. Augustine, stood alongside the executive director of Chicago Animal Care and Control, Kelley Grandurski, during a press conference about the capture officials confirmed that the alligator was unharmed in the process.
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Robb presented Chance to captivated reporters at the Humboldt Park Boathouse Tuesday morning, ending the unusual, week-long hunt.
The animal is an American alligator about four feet long.
"It is a handsome, beautiful alligator", Gandurski said, adding that it is "very healthy".
All of Humboldt Park is now open following Chance's capture.
"These types of animals don't make good pets", she said. Animal advocates also urged officials not to harm the alligator.
Chance The Rapper had some competition roaming the streets of Chicago this past week. The alligator, however, "was exhausted, too, I'm sure", he said.