Keith Horton, Leaf-curling spider (April Theme: Detail)

Leaf-curling spiders (Phonognatha sp.) shelter in curled leaves at the centre of their webs. The leaves are tied shut with silk threads at the top and left open at the bottom. The spiders sit inside the leaf with only their legs showing, feeling for the vibrations of a captured insect. The leaf protects them from birds and other predators.

Images have been resized for web display, which may cause some loss of image quality. Note: Original high-resolution images are used for judging.