Resumen de Un gran grup d'orenetes de ribera (Riparia riparia) parades al terra
Luis Miguel Copete, Lluís Gustamante, Rafael Mateo
Staying on the ground, for feeding, bathing, roosting or mating is considered on unusual behaviour in the Hirundinidae family. Here we describe the observation of up to about 2, 000 Sand Martins Riparia riparia staying together on the ground, forming a large flock, in the Ebro Delta (Tarragona, NE Spains. Birds stayed there for seven days, being only recorded during the last hours of the day. Circunstancial evidence suggest that the birds were just resting beheen migration episodes or have formed a flock prior to going to the roost.
