形容詞 gregarious:

1. (of animals) tending to form a group with others of the same species
2. instinctively or temperamentally seeking and enjoying the company of others
3. (of plants) growing in groups that are close together

gre.gar.i.ous

adj.（形容詞）
Seeking and enjoying the company of others; sociable.See Synonyms at social
合群的，愛(ài)交友的：尋覓和喜愛(ài)與他人為伴的；愛(ài)交友的參見(jiàn) social
Tending to move in or form a group with others of the same kind:
群居的：有與同類(lèi)合成一群傾向的：
例句：
gregarious bird species.
群居的鳥(niǎo)類(lèi)

Botany Growing in groups that are close together but not densely clustered or matted.
【植物學(xué)】 聚生的：成群生長(zhǎng)但不密集或叢簇生的

來(lái)源：
Latin greg3rius [belonging to a flock]
拉丁語(yǔ) greg3rius [屬于一群的]
from grex greg- [flock] * see ger-
源自 grex greg- [一群] *參見(jiàn) ger-

【引伸】
gregar.iously
adv.（副詞）
gregar.iousness
n.（名詞）