Snakes
Sometimes the rustling is a snake on his way to a sunny spot where he can bask and sleep. Very slender brown speckled snakes, or blind-worms, are quite harmless, and so are the large grass-snakes, which are something like a mackerel in lines and markings. The adder, however, which is yellowish brown in color with brown markings and a "V" on his head, is dangerous and should be avoided.