What's wrong with the crow's buttocks sticky shit

Crow's butt sticky shit is usually caused by disease.It is different in different seasons.During the breeding period, it is mainly eaten turtle, beef, ruler moths, pine caterpillars, land tigers, etc., and can also eat spiders, bird eggs and chicks.At other times, it mainly eats pine nuts, rubber, berries, grass, etc., occasionally eating insects, and even eating corn and other crops in farmland.