The Grasshopper Warbler is a rather inconspicuous brown warbler. It visits Britain and Ireland in summer and spends winter in north-west Africa.
Males and females look alike. Their plumage is brown, with paler colouring on the underside.
From 2005 to 2019, a 15-year comparison followed Grasshopper Warblers in southern Sweden. The core site was a 33-ha nature reserve; the 47-ha satellite area followed the Kumlaån stream about 2 km away. The study recorded territory density and male arrival timing.
Male territory density was lower and arrivals later in the satellite area. Its population declined significantly, while the core population showed no significant change. General patterns of territory use were similar in both areas.
An extinction-risk assessment has not been added yet.
The satellite area had lower male territory density and later spring arrivals; its population declined significantly over the 15-year study.