First there are big mouths and groupthink.
Then there is chasing each others tails.
This could lead to literally going off a cliff.
Typically, like wolves, they hunt viciously in packs.
When they are stalked, they run scared leaving the weakest to serve as prey.
When hunted, they are separated and slaughtered.
Herds serve a survival function in nature, but when the herd is dumb, as if often the case, they die off and are left extinct. ;-)
(Source Photo: Andy Blumenthal)