Finches and thrushes, like Goldfinches and Song Thrushes, will start to struggle for food this month; this is because the dwindling supplies of berries have yet to be replaced by the new growth of spring. The first Chiffchaffs and Sand Martins will be arriving from the Mediterranean and Africa, as will Ring Ouzels and Ospreys.
Summer-visiting Chiffchaffs arrive before the Willow Warblers, a species with which they may be confused. However, remember "C before W", and also that Chiffchaffs have shorter wings, because they migrate shorter distances, have shorter eyebrow stripes and also a shorter name!
British Science Week celebrates science, engineering and technology and has thousands of events across the country for people of all ages.Find out more.