Cwm Fields is a botanist’s delight. Look for heath spotted and southern marsh orchids, cross-leaved heath, tormentil, lousewort, petty whin, ivy-leaved bellflower, devils-bit scabious and many other wonderful rhos pasture flora. In May and June watch for small pearl-bordered fritillary butterflies, named for the seven small white pearls on their hindwing underside. Stonechats will perch on gorse bushes, listen for their song which sounds like two stones being hit together. Brown-banded carder bees feast on trefoil and black knapweed, and grass snakes sunbathe at the bracken's edge.