Simple

These nature crossings allow wildlife to move over large roads and highways without any danger. They also allow us to track populations based on the frequency of crossings. The only problem is animals gotta teach other animals about the crossing and until they do they won’t use it.

I'm in the same bridge. I get what's happening, but I don't get what, if any, the punchline is.

The deer have discovered a breach in our defences, France will soon be annexed.

I think the humor is in thinking one deer was like "holy shit, I've got to tell the others" and then giving a formal presentation where the other deer are also like "holy shit"

Its a green bridge like animal crossing to encourage wildlife to cross our infrastructure without getting run over.

Its pretty sad and depressing when you drive for 2 hours and see at least 2 deer and 1 hedgehog roadkills, where it can be reduced by just not only thinking about ourselves.

My read of this is: Deer and squirrels tend to run in front of moving cars*. The two species are distressed that something interrupted their ability to bolt into traffic.

*Where I live, obnoxiously and assertively so. The mule deer almost wait for cars to approach, run into the road, and then just stand there. Traffic-blocking protests have nothing on the deer.

My understanding: First deer discoveres a case when you can run over road unharmed. Teaches others, where they understand one can run safely over the road anywhere, thus the suprisement. Probably farfetched, but dank.

Bovines are cows. Deer, iirc, are cervines.