A Chicago-based technology consulting firm’s downtown headquarters was found overrun with live penguins Tuesday evening after building security discovered that surveillance cameras on the loading dock and freight elevator had been looped — and that the firm’s 28th-floor offices were full of birds. The firm, which agreed to provide access to internal materials and one HR representative on condition of anonymity, has not been named in this report. The perpetrator has not been identified — but local law enforcement says they have a person of interest they have been unable to locate.

According to building security, surveillance cameras on the loading dock and freight elevator were looped starting at approximately 5:40 PM on Tuesday — just as the last employees were leaving for the day. The feeds showed the same twelve seconds of empty hallway on repeat. Security did not notice the loop until roughly ninety minutes later, when a guard reviewing a routine check spotted penguins wandering past a camera on another floor.

“I’m watching the feed and a penguin just — walks across the screen,” said one security guard. “I called my supervisor and said, ‘You need to come look at this.’ He thought I was joking. I sent him a screenshot. He stopped thinking I was joking.”

A second guard, dispatched to the freight elevator, was less diplomatic. “There was a dolly in there. There was what I can only describe as a penguin playpen. Whoever did this was long gone. The dock cameras were looped the whole time — same empty hallway, over and over. We’ve got nothing but penguins on film.”

Authorities are now seeking a software consultant who works out of the firm’s Milwaukee branch for questioning. The man, whose identity has been withheld, has not been located. He was identified as a person of interest based on a well-documented history of annual April Fools’ stunts at the company, each more elaborate than the last. Of particular note: in 2022, he snuck into the Milwaukee branch office after hours and staged a miniature “penguin invasion” using dozens of small penguin figurines — a stunt that in retrospect appears to have been a proof of concept.

“This has his fingerprints all over it,” said one coworker Wednesday morning, after employees arrived to find the aftermath. “Figuratively. Apparently not literally, which is the problem.”

“This isn’t his first April Fools’ prank,” said a company representative. “The penguin theme, the after-hours access, the escalation pattern — it all points in one direction. But we can’t prove anything yet.”

“The thing that gets me,” said a senior developer who has worked with the suspect for several years, “is that he’s the kind of guy who would do this and have a perfect alibi. He once automated an entire deployment pipeline at 2 AM and was asleep by the time anyone noticed. They call him ‘the robot.’ If he did this, we’re not going to find proof unless he wants us to.”

The man has not responded to requests for comment. Calls to his personal phone have gone unanswered since Tuesday evening. One coworker noted that his work laptop has not connected to the company VPN since 4:30 PM on Tuesday — roughly an hour before the camera loop began.

How anyone acquired what witnesses would later describe as “a horde” of live penguins remains unclear. A refrigerated box truck with Wisconsin plates was found parked in the building’s loading zone, though its registration traces to a shell company with no apparent connection to the suspect. The truck had been wiped clean.

The company declined to provide further details about the species, quantity, or origin of the penguins. The company’s internal communications platform had, as of Wednesday morning, a dedicated channel titled “Penguin Situation” with 847 messages and a pinned post from someone in Facilities that read “DO NOT open the server room without contacting IT first.”

“We’ve reviewed the employee handbook extensively,” said a source in the company’s HR department, “and there is, in fact, no policy that specifically addresses live penguins. We’re updating our guidelines accordingly.”

Sources close to the investigation noted an unsettling level of planning. Fire doors on multiple floors had been propped open with what appears to have been a gym bag — allowing the penguins to scatter freely once released. The building’s freight elevator was accessed using a keycard that traces back to a deactivated employee badge from a contractor who left the firm in 2019 (the company’s IT department is reportedly discussing this in a separate internal channel). The elevator has a weight limit of 2,500 pounds, which animal control officers said was a relevant consideration once they began counting.

“So we were just supposed to — what? Come in the next morning and deal with it?” said another coworker. “Just start our day? With penguins?”

“What about the POOP?!” exclaimed one witness. “Oh lord, the poop!”

Local law enforcement confirmed that the incident is under active investigation, coordinating with building management and the firm’s HR department. Building management, which leases the office space to the firm, issued a separate statement that was notably longer than the company’s own and expressed “serious concern” over the incident, confirming that an internal review of after-hours access policies is underway.

Chicago Animal Care and Control was dispatched shortly after the loop was discovered, but containment took significantly longer than expected. Officers spent nearly two hours corralling the penguins, which had scattered across multiple floors. Several were found huddled in conference room corners. One had made it into the server room.

“They’re fast,” said one Animal Care and Control officer, who described it as “a first in my seventeen years on the job.” “People don’t realize — penguins are fast, they bite, and they do not want to be caught.”

The penguins have since been transferred to the custody of Lincoln Park Zoo, where a spokesperson described them as “confused but unharmed.” One of the penguins, reached for comment at the zoo on Wednesday, said “WAAAH” and bit the microphone.

The incident has also reignited familiar tensions along the state border. “This is exactly what we’ve come to expect,” said one Chicago resident who had gathered outside the building. “You let one of them drive down from Wisconsin and this is what happens. Penguins.”

As of press time, the suspect’s LinkedIn profile still lists him as employed at the company. His most recent endorsement, dated March 30th, is for “Team Building.” His profile bio reads: “I automate things.”