As for the four-legged ones, they're actually feral hogs – descendents of early livestock that went wild.
Some herds of cattle and horses run wild; but these were, of course, introduced, as were also the wild hogs, the numerous rabbits and the less common hares.
The number of horses was 192,000 in 1910; of dairy cows, 297,000; of hogs, 1,356,000; and of sheep, 215,000.
The famous meadows near Salisbury are mentioned, where, when cattle have fed their fill, hogs, it is said, " are made fat with the remnant - namely, with the knots and sappe of the grasse."
The following passage indicates the contemporary theory of manuring: - " In thy tillage are these special opportunities to improve it, either by liming, marling, sanding, earthing, mudding, snayl-codding, mucking, chalking, pidgeons-dung, hens-dung, hogs-dung or by any other means as some by rags, some by coarse wool, by pitch marks, and tarry stuff, any oyly stuff, salt and many things more, yea indeed any thing almost that bath any liquidness, foulness, saltness or good moysture in it, is very naturall inrichment to almost any sort of land."