This section is from the book "Commercial Gardening Vol1", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
These much - maligned animals must be regarded amongst the best friends of the cultivator. The Frog (Rana temporaria) feeds upon insects and small slugs, and will also devour beetles and fairly large insects. The Toad (Bufo vulgaris) will also destroy large numbers of insects, including slugs, beetles, woodlice, and even worms. The toad will only eat living things, and therefore makes sure of this condition by waiting until its victim shows signs of life. At the least movement the toad darts out its tongue and swallows its prey at a gulp, except in the case of worms, which require a little more attention. The Common Lizard (Zootoca vivipara) lives upon various kinds of beetles and insects that are injurious to garden plants.