Why is such a tunnel needed?

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

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This kind of looks like the new one they're building in Banff National park. I drove through over the summer when they started it. They have a bunch of them set up throughout the park.

https://discoverapega.ca/stories/wildlife-crossings-key-to-highway-safety-in-banff/

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