Tiny picnic invaders WSJ Crossword Clue

Think of the uninvited guests that often march in line to your outdoor meal.

???? are small, social insects known for living in colonies and often found near food.

The clue refers to small creatures commonly found at picnics. 'Tiny' suggests something small, and 'invaders' implies uninvited guests, which is a common way to describe ???? at a picnic.

Workers in a colony, ___ climbing a tree (Sichuan noodle dish), "Empire of the ___" (1977 sci-fi film with an approval rating of 5% on Rotten Tomatoes), Tiny hill builders, Insects with complex social system