carrier pigeon
US /ˈkær.i.ər ˌpɪdʒ.ɪn/
UK /ˈkær.i.ər ˌpɪdʒ.ɪn/

1.
pombo-correio
a pigeon trained to carry messages
:
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During the war, carrier pigeons were used to send secret messages.
Durante a guerra, pombos-correio eram usados para enviar mensagens secretas.
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The old man kept a flock of carrier pigeons on his rooftop.
O velho mantinha um bando de pombos-correio no telhado.