Several of the elaterid larvae, however, gnaw roots and are highly destructive to farm crops.
Beavers also gnaw the bark of birch, poplar and willow trees; but during the summer a more varied herbage, with the addition of berries, is consumed.
When confined, they will gnaw through the hardest wood in order to make their escape.
This experiment was partially successful, but the instinctive dislike of bees to anything of a fibrous nature caused them completely to spoil their work of comb-building in the endeavour to tear or gnaw away the linen threads whenever they got in touch with them.
The muskrat will gnaw his third leg off to be free.