cuckoo
US /ˈkʊk.uː/
UK /ˈkʊk.uː/

1.
cuco
a medium-sized, long-tailed bird, typically with a grey or brown back and barred white underparts, noted for its characteristic two-note call and its habit of laying eggs in the nests of other birds.
:
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The sound of the cuckoo signaled the arrival of spring.
El sonido del cuco anunció la llegada de la primavera.
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The female cuckoo lays her eggs in other birds' nests.
La cuco hembra pone sus huevos en nidos de otras aves.
2.
loco, tonto
a person who is foolish or insane.
:
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He's gone completely cuckoo, talking to himself all day.
Se ha vuelto completamente loco, hablando solo todo el día.
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Only a cuckoo would try to climb that mountain without equipment.
Solo un loco intentaría escalar esa montaña sin equipo.