They came in flocks to see the procession.

他们成群结队来看游行队伍。

《牛津词典》

People come in flocks to see the new bridge.

人们成群结队地来参观新桥。

youdao

Vistors came in flocks to see the new bridge.

参观者成群结队地来观看这座新桥。

youdao

One would be characteristic of semi-nomadic pastoralists: the sacrifice of the first lamb born in the spring to the deity in order to procure favor and continued blessing on the flocks for the spring.

一种是具有半游牧人的特色：,他们把春天里的第一只羊羔献给神,为了获得神的偏爱,来年春天继续赐福。

耶鲁公开课 - 旧约导论课程节选

Everything else is covered by snow, so pigeons are attacking in flocks.

BBC: How are farmers coping with the snow?

Black pied crows perch in their dead branches and then suddenly take off in flocks to surf the swirling breezes around the dunes.

CNN: Romancing the dune in Namibia

According to the US Geological Survey, the American Buff-Bellied Pipit is 5.5in (14cm) in length and is usually found in flocks in ploughed fields, shores and tundra.

BBC: American Buff-Bellied Pipit