Essays in War-Time

the environment, in which the dingo, by superior intelligence in finding food and rearing young, and by greater resisting power to climate and disease, was able to succeed where the thylacine failed. Again, the supposed war of extermination waged in Europe by the brown rat against the black rat is (as Chalmers Mitchell points out) pure fiction. In England, where this war is said to have been ferociously waged, both rats exist and flourish, and under conditions which do not usually even bring them into competition with each other. The black rat (_Mus rattus_) is smaller than the other, but more active and a better climber; he is the rat of the barn and the granary. The brown or Norway rat (_Mus decumanus_) is larger but less active, a burrower rather than a climber, and though both rats are omnivorous the brown rat is more especially a scavenger; he is the rat of sewers and drains. The black rat came to Northern Europe first--both of them probably being Asiatic animals--and has no doubt been to some extent re