How do Ravens Find Sand Lance - Bob Armstrong's Nature Alaska

https://vimeo.com/334979983

How do Ravens Find Sand Lance is a question I have often pondered.
Ravens and crows seem to be able to find sand lance better than Eagles and Gulls which appear to only get them only by stealing from the corvids.
Some birds can hear really well and I wonder if they can hear them under the sand.
Of interest is ravens often cock their head and then run off in a different direction and dig one up.
Pacific Sand Lance are one of the most important forage fishes in Alaska to learn more about them look at Sand Lance A Review of Biology and Predator Relations and Annotated Bibliography