devtrackers.gg
Way back when we had to keep track of abou 10x as many mats, you could get horns and hides by hitting the goats (they were used in the defender and sentinel sets, which didn't use behemoth drops).
They got the stagger effect and dropped the mat. You could keep knocking them out afterward (though they wouldn't drop extra parts). Sentinel set was huge because at the time it was the only way to get extra part damage (and certain parts of a few behemoths had almost as much hp as the behemoth as a whole).
The goats were also total jerk faces and used to knock you over all the time and people HATED it.