Grasshopper Warbler Locustella naevia

This small summer migrant travels from Africa to breed in the reedbeds of the UK. Rarely seen but given away by its insect-like trilling call; the movement of the head during calling makes it tricky to pinpoint the exact location of the singing perch. Image: Neil Rolph (Flickr).

Find out more: RSPB, Suffolk Wildlife Trust, iNaturalist