I found such a photo on the Internet and became interested in what function such a structure could perform.

  • Funderpants @lemmy.ca
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    11 months ago

    I’d like to read about that,understand how it’s done. it’s a thought I have whenever I see them but of course the professionals designing them would have thought about it.

    • NarrativeBear@lemmy.world
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      11 months ago

      There was a documentary I watch years ago where they went into great detail into this, as well as the design of these things. Can’t remember where i saw this documentary though.

      Anyways, researchers setup cameras trigger by movement and body heat to watch these overpasses and found no evidence of higher predetor active.

      They also went into detail about how these things are design with extra width and gentle slopes to make them as “friendly” as possible depending on the specific species that will be migrating in the area, as different wildlife species prefer different types of crossing structures.

      For example:

      Grizzly bears and wolves

      Wary animals like grizzly bears and wolves there is a “learning curve”, it may take up to five years before they feel secure using newly built crossings. Grizzly bears, elk, moose and deer prefer wildlife crossings that are high, wide and short in length, including overpasses

      Cougars and black bears

      Cougars and black bears prefer long, low and narrow crossings such as underpasses.

      Elk

      Elk are usually the first large species to use the new crossings, even using some while they are still under construction!

      Here are some articles that talk about some of the studies:

      https://wildlife.org/wild-cam-do-predators-ambush-at-underpasses/

      https://www.nature.com/articles/s41598-020-67340-8

      • Sparlock@lemmy.world
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        11 months ago

        Yea elk don’t give a fuck about much really. We have a few herds where I live and they don’t even move when we walk our dogs nearby. I even have a video of one coming right up to the fence around my property, both my great pyrenees were losing their minds with the elk less than a foot away, the elk seemed more curious about the noisy little things (“little” relative to a full grown elk that is) than anything else.

    • GingeyBook@lemm.ee
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      11 months ago

      IIRC they just hire someone to sit there and say “shoo” at any potential predators