ISTR a thread about that earlier, but I can’t find it anywhere.
In any event, I’m listening to the audiobook of David Sedaris’s short-story collection Squirrel Seeks Chipmunk, and in the story “The Crow and the Lamb,” he has a devious crow do just that.
What prevents the newborn lambs from closing their eyes? Or is that not enough to stop eyes from being plucked out? Why couldn’t this happen to adult lambs, cows, etc?
Crows are quite capable of taking out the eye of a live, adult sheep.
Apart from during birth it most commonly happens when the animal gets cast … i.e. it lies down and gets rolled onto it’s back or side and can’t stand up again, say it’s in a small hollow. Much less common with cattle as 1. they are much larger/stronger and 2. they don’t have a fleece which can be a significant hinderance to rolling back upright.
Can also occur as a corollary of metabolic disorders like hypoglycemia (aka pregnancy toximia), hypocalcemia (aka milk fever) and hypomagnesemia (aka grass tetany) or low blood glucose, calcium & magnesium respectively and the animal is unable to stand.
As the animals weaken, the crows will move in.
I’d suspect that out in the rangelands a large proportion of animals with fatal diseases would lose an eye to the crows before they actually died. The difference in the cases above is that if found in time and the cast animal uprighted or the mineral disorder treated they can make a full recovery, sans eye.
Crows are also a major problem with cattle during droughts. Animals wander into river and dam beds looking for water, and get stuck in the mud. Crows then relieve them of their eyes. while they are perfectly healthy and alert.