hey guys i keep hearing people talking about crows relating to caving, I personally haven't seen any crows underground, are there specific caves where cave-dwelling crows can be found? No scientific papers seem to reference them either. I'm wondering if any biological studies have been done, particularly by the BCA as they seem to keep going on about them.

Cheers
Tarquin

I suppose you could try looking in Nyth Bran series in OFD. 
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Or possibly Jackdaw Hole near Sell Gill, or more likely Nyth y Gigfran near Ffestiniog.

Some young jackdaws were recently rescued from the bottom of Eldon Hole

We frequently spot "Chouca's, a kind of small black chew" who are nesting in the entry pitches and holes in caves on the PSM (France/Spain). I've seen nest at -35m in the entrance with live birds in it.

https://fr.wikipedia.org/wiki/Choucas_des_tours

There is even a small history fact about the discovery of the Puits Lepineux were 2 choucas were involved.

"Avant de d?marrer notre marche, Jean-Fran?ois nous raconte l?histoire de la d?couverte du gouffre de La Pierre Saint-Martin, il la conna?t sur le bout des doigts. La passion qui l?anime en la racontant est communicative. En 1950, Georges L?pineux et un physicien italien jettent un caillou et deux choucas s?envolent, c?est la d?couverte du gouffre qui portera le nom de son inventeur et le d?but d?une grande ?pop?e. ?

source : https://www.topopyrenees.com/la-grotte-de-la-verna/comment-page-1/

Also vultures do nest in holes in the cliffs.

I've seen crows in Eldon Hole, mildly suitable as Badlad helps dig there

Lots of jackdaws in residence in Peak Cavern's entrance.