Cole didn't stop there, and got in touch with members of Aurora city council, the mayor and even PETA.
"I just wanted to make sure the word got out to everyone about this guy," he noted.
It turns out, Cole wasn't the only visitor horrified by what he saw at the festival.
Organizers of the Aurora Chamber Street Festival have been getting complaints about the exhibit since Sunday.
"We are very grateful that this has been brought to our attention," Crystal Walsh of the Aurora Chamber of Commerce told The Dodo.
Walsh says organizers "are not going to hire this company in the future or have an event of that nature."
Tiger Paw Exotics, a traveling zoo that bills itself as "family-oriented" on its website, responded by email several days after the story was published.
In a statement, zoo owner Tim Height called reports about the condition of the animals "false and outright lies."
Height noted when his staff was setting up the zoo, "the weather was overcast and cool."
"At the time when the photo of the kangaroo was taken the sun had just broken through."
In addition, he explained, "kangaroos in their native land relax and sleep during the day and are active in the morning and evening."
But it isn't the first time Height's company has been the subject of complaints about its animals. Tiger Paw Exotics came under fire in March for its treatment of a camel at another event, which seemed to be ailing in a small enclosure.
"A camel doesn't move around a lot, they like to lie down," Height told City News at the time. "To us it's not an issue, but if we find out the public has an issue, we don't mind changing it."
Organizers of the Aurora street festival, however, are taking more decisive action.
"We want everyone to know that we appreciate the concern around this," Walsh said. "We're concerned as well. We're taking action to ensure it doesn't happen again."
To read more about the exotic pet trade and why it's cruel to animals, go here.