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By Ben Hooper, UPI

A worker at a Houston high rise captured video of an unusual sight outside one of the building's windows -- dozens of bats gathered in a swarm on the wall.

Dave Rojas, who works in an office at the building, tweeted a video showing dozens of bats gathered together to roost right outside a window.

Rojas said the building is an annual hub of bat activity.

"Every year the bats make a visit to our office. It must be that time of the year again. I think they are migrating," he wrote.