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Building nurseries for big-eared bats

We're hopeful that Utah's bats will use new maternity sites

Tony Wright is the Conservation Wildlife Biologist in the Southeastern Region. He works with a wide variety of birds and mammals, all the way from Soldiers Summit to Monument Vally.

The Allen’s big-eared bat is an uncommon bat found in the southern third of Utah. This pair of ears with a small bat behind it maneuvers its way through forests and riparian thickets, capturing insects from high in the mountains to deep in desert canyons.

A close-up of the Allen's big-eared bat.

A close-up of the Allen’s big-eared bat.

The bats are quite particular about where they’ll give birth and raise their young. Beneath loose bark on ponderosa pine snags appears to be a favorite location.

Unfortunately, snags with the right characteristics have a limited lifespan before they lose the loose bark and fall over. The widespread cutting of ponderosa snags for firewood is aggravating the situation, leading biologists to fear that a lack of maternity sites may be clouding the outlook for this species.

A look at the artificial bark we're placing as maternity sites for bats.

A look at the artificial bark we’re placing as maternity sites for bats.

A DWR crew, using funding from Utah’s Endangered Species Mitigation Fund, and with the help of the Manti–LaSal National Forest, spent the month of May putting up artificial bark on live and dead trees. We want to see if bats will roost and raise young beneath it.

A company in Kentucky makes this bark especially for bats, and it has proved successful in the east. The crew put up screen troughs on the tree trunks below the bark, which they refer to as poop-catchers. We will check these over the next few years and if all goes well, we’ll have plenty of bat poop waiting for us.

There’s a lot to learn about what kind of trees, which side of the tree and the height bats prefer. We — along with the Forest Service — have started up this learning curve and we hope to have a valuable management technique to add to our bat management tool kit in the near future. We’ll keep you posted!

5 Responses to Building nurseries for big-eared bats

  1. Good job Tony. As always an interesting project.

  2. Intriguing concept! Best wishes on a hugely successful outcome.

  3. Toxicokinetics

    Their airs are big, but their bodies are small.

  4. “Pair of ears with a small bat behind them”

    Nice. I’m glad we have people with personality managing our wildlife. 🙂

  5. Jenn at Sundog

    I see this work was conducted in 2015. Can you tell us the results? We’d like to do something similar here in Northern California for some of our bats.

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