The meaning of herd is a large group of animals, especially hoofed mammals, that live, feed, or migrate together or are kept together as livestock.
"a herd of elephants".
Meaning of jury is a body of people (typically twelve in number) sworn to give a verdict in a legal case on the basis of evidence submitted to them in court.
"the jury returned unanimous guilty verdicts"
Meaning of swarm is a large or dense group of insects, especially flying ones.
" I see a swarm of insects in the distance".