In spite of the wide distribution of the Collared Plover (Charadrius collaris), its reproductive ecology is poorly known in Colombia, considering that the only evidence of breeding by this shorebird dates from 1948. Since a young under parental care was observed in Cordoba department, we initiated a search for direct evidence of breeding of Collared Plover in several localities of the Sinú river delta estuary. We document some aspects of the reproductive ecology of the Collared Plover and we report the first records of its nests in Colombia.