noun, masculine/oɾmiˈɡeɾo/plural: hormigueros
hormiguero is masculine in Spanish.
anthill; ant colony; place with lots of people; antbird; ellipsis of oso hormiguero
Inherited from Vulgar Latin *formīcārium, from Latin formīca. Compare Portuguese formigueiro, Catalan formiguer, Italian formicaio, Romanian furnicar.