this post was submitted on 29 Nov 2023
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I found such a photo on the Internet and became interested in what function such a structure could perform.

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[–] NarrativeBear@lemmy.world 19 points 11 months ago (1 children)

It's taken into consideration of the design of these crossings.

[–] FunderPants@lemmy.ca 4 points 11 months ago (2 children)

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 30 points 11 months ago* (last edited 11 months ago) (2 children)

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

[–] FunderPants@lemmy.ca 6 points 11 months ago

Awesome, thank you.

[–] Sparlock@lemmy.world 4 points 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 13 points 11 months ago (2 children)

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

[–] FunderPants@lemmy.ca 9 points 11 months ago* (last edited 11 months ago)

How can I get this job? I'm almost 40 and I haven't been eaten by a mountain lion yet. 100% success. I'm qualified.