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Most migrants feed intensively before leaving, to build up stores of fat for the journey. Sedge warblers take this to extremes. Sometimes these small birds double their weight, storing fat even under the eyelids, becoming almost spherical and hardly able to take off. They cross the Mediterranean and Sahara in one hop to tropical Africa.
This edited article originally appeared in Look and Learn issue number 905 published on 26 May 1979. Click on a picture to find out more about licensing images for commercial or personal/educational use. We are also able to license textual material. Please contact us for details.