How much the breeding of pheasants has told upon the existence of other creatures in fur and feathers I have already shown; and much the same thing is true of the preservation of trout. There is this difference, however: that while the pheasant has now produced its utmost effect, the alterations due to trout are increasing. Trout are now so highly and so widely preserved that the effect cannot but be felt. Their preservation in the numbers now considered necessary entails the destruction of some and the banishment of other creatures. The most important of these is the otter. Guns, dogs, traps set under water so as not to be scented; all modes of attack are pressed into the service, and it is not often that he escapes. When traces of an otter were found, a little while since, in the Kennet--he had left his mark on the back of a trout--the fact was recorded with as much anxiety as if a veritable wolf had appeared. With such animosity has the otter been hunted that he is becoming one of the rarest of wild animals here in the south. He is practically extinct on the majority of southern streams, and has been almost beaten off the Thames itself. But the otter is not likely to be exterminated in the sense that the wolf has been. Otters will be found elsewhere in England long after the last of them has disappeared from the south. Next the pike must be ousted from trout-streams. Special nets have been invented by which pike can be routed from their strongholds. Much hunting about quickens the intelligence of the pike to such a degree that he cannot be secured in the ordinary manner; he baffles the net by keeping close to the bank, behind stones, or by retiring to holes under roots. Perch have to go as well as pike; and then comes the turn of birds.