fire ant
US /ˈfaɪər ænt/
UK /ˈfaɪər ænt/

1.
formiga-de-fogo
a small, aggressive, reddish-brown ant that inflicts a painful, burning sting and is native to South America but has been introduced elsewhere.
:
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Be careful where you step; there might be a fire ant nest nearby.
Cuidado onde pisa; pode haver um ninho de formigas-de-fogo por perto.
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The park was closed due to an infestation of fire ants.
O parque foi fechado devido a uma infestação de formigas-de-fogo.