Abstract
This paper is the first in a series on the environment of the freshwater sponge, Spongilla lacustris, the rat tapeworm, Hymenolepis diminuta, the common octopus, Octopus vulgaris, the cane toad, Bufo marinus, and the chimpanzee, Pan troglodytes. A new version is given of the formal symbolic definition of total environment, which was published by Niven (Erkenntnis, 1982, 17, 307-20). Informal defining equations are then presented, with examples from the environments of the five species of the study.

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