The world in its entirety is one visible animal, comprehending within itself all other animals.
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“There is only one world, not many, as various pre-Socratics had taught; there cannot be more than one, since it is a created copy designed to accord as closely as possible with the eternal original apprehended by God. The world in its entirety is one visible animal, comprehending within itself all other animals. It is a globe, because like is fairer than unlike, and only a globe is alike everywhere. It rotates, because circular motion is the most perfect; and since this is its only motion it needs no feet or hands.” source