Roosting behaviour of Whimbrels was investigated in the northern Netherlands. The roost was situated on a dump (26 ha) of waste products of a sugar factory. The first Whimbrels arrived at the roost 2.5 hrs before sunset. The median point of arrival at the roost was reached 40 minutes before sunset (Fig. 1). Smaller numbers apparently used the area as a pre-roosting site. Preening, looking around and sleeping were the major activities at the roost, every now and then interrupted by short flights as a result of disturbance or newly arriving flocks or Carrion Crows (Fig. 2).