Gregarious (adjective)
Someone who is gregarious enjoys the company of others. He or she is sociable. In biology, the word is used to refer to those animals and birds that live in large groups.
Origin
The word gregarious comes from the Latin word grex which means herd or flock. In the 17th Century, the English word gregarious was used to refer to social animals and birds. But by the 18th Century, it was being used for social human beings as well.
Usage:
Being gregarious, she was able to make friends in the new city.
Locusts are usually solitary insects, but at a certain point in their lifecycle they become gregarious and form massive swarms.
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