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The Harvey effect on the Waugh Street Bridge bat colony

It was bad, but we hope they will recover.

Tens of thousands of bats perished or were displaced from their home at the Waugh Bat Colony when Hurricane Harvey swept through the city this summer, according to bat experts.

“Pre-Harvey, we had at least 300,000 bats in the bridge,” said Diana Foss, a wildlife biologist with the Texas Parks and Wildlife Department, and coordinator of the Houston area bat team.

“But watching the emergence at Waugh right now is kind of depressingly lower than that,” she continued, describing the daily flood of bats from beneath the bridge at Allen Parkway and Waugh Drive, during which bats emerge en masse at twilight to hunt for food. “What I’m seeing is, about half the bats are emerging.”

When the hurricane dropped more than 50 inches of rain on the city, the bayou’s water downtown surged to record levels. For the first time since the bats took up residence in the cracks beneath the Waugh overpass, the elevated highway was submerged. Bats lacked the 15 feet of clearance they need to drop down from their roosts and take to the sky. Their plight didn’t go unnoticed. Residents tried to save the bats, hanging off the bridge and scooping them from the water as they rushed by. But it wasn’t a perfect science.

[…]

In the days and weeks after the storm, residents noticed a new pattern in the sky during the bats’ evening emergence: In addition to a swarm of winged mammals flying out from beneath the bridge, smaller populations exit from nearby buildings. They join up with the bats from the bridge during their hunt, then return to their new homes for the night, before repeating the same cycle the next day.

Whether these displaced bats will return to their former home under the bridge isn’t yet known, said Cullen Geiselman, a member of the local bat team, who earned her doctorate studying bats.

“I guess they could have moved on,” she said. “We’ve played with some ideas and haven’t gotten very far.”

Houstonia wrote about this in the immediate aftermath. As noted, some number of bats managed to move to other dens, and some others have returned to Waugh. The overall population is definitely smaller, and bats don’t have high reproduction rates, but the hope is that over time the colony under the bridge will get back to its previous side. I’m rooting for them.

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2 Comments

  1. mollusk says:

    It’ll be interesting to see what The Powers That Be at American General Center do if the bat colonies that are now in the parking garages stay (or even grow) there. The tenant mewling could get deafening.

  2. Bill Daniels says:

    @Mollusk:

    I love bats as much as the next nature lover who also hate mosquitos, but if I had my car peppered with guano 5 day a week, I’d be mewling for them to go, too.

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