BIL, back in the day, ran about 20 head of Holstein milk cows. We had to pen one of them when a birth was due. She had such a strong mothering instinct she would attack the other cow and take the calf as her own.
She was - shall we say - right sporty when we went to seperate her from any of "her" calves.
When she dropped herself, unexpectedly (Jerry goofed the timing), I had a heck of a time finding the calf. She came in at milking time with the others (he had them trained to come when called). Somehow, she either convinced the newborn to go hide about 100 yards outside the pasture fence, or crawled the fence herself, both ways, to drop or hide her calf out there.
Then there was the time a black white-face heifer (Daisy!) didn't come in with the others, so Jerry sent me out on foot to bring her in, knowing she must have dropped during the day. Big pasture, with just one skinny little 20' tree in it.
And boy was I glad it was there!
When I didn't come in in a timely manner, Jerry came out more than an hour later on the saddle horse, looking for the body.... I was still up the tree, and Daisy was still under it, daring me to come down.
Brownie, the saddle horse, once balked at creek edge which she had jumped a few minutes before. I thought that tensing of her muscles meant she was going to jump it again, but I was all wet.
Working summers for Jerry had it's ups and downs.
Good luck with your calvings, guys.
