unlike Marx, Morton sees himself (and other humans) as sharing nature with (productive) animals and even other inanimate (productive) things: "I'm a being like a silkworm [...] my labor can be equated with the productivity of the soil" (both 60)
also 60: "Production, as in the writing of a brilliant poem, is the thing we can't help doing, your species-being. This is exactly how it can be exploited. It just happens anyway, so the capitalist can dip a bucket into its flow to extract labor time from it and homogenize it"
61: "the nonhuman aspect of humans [is that] production is how they behave"
see also 57-58, which contains more on Marx's opinion about silkworms and bees, etc.