Turtles are reptiles, older even than the dinosaurs they have managed to establish themselves on every continent except Antartica and can survive in a wide range of habitat.
We commonly use the term parasite as quite an apt description of self-interested human hangers-on who benefit from the work of others without contributing anything themselves. The term used more scientifically, generally refers to an individual organism (parasite) which has a close association with an individual organism of another species (host) in which the parasite takes from the host and does it harm.
Why does attentiveness to nature matter? In a very fundamental sense, we are what we pay attention to. Paying heed to beauty, grace, and everyday miracles promotes a sense of possibility and coherence that runs deeper and truer than the often illusory commercial, social "realities" advanced by mainstream contemporary culture. ... Our attention is precious, and what we choose to focus it on has enormous consequences. What we choose to look at, and to listen to--these choices change the world. As Thich Nhat Hanh has pointed out, we become the bad television programs that we watch. A society that expends its energies tracking the latest doings of the celebrity couple is fundamentally distinct from one that watches for the first arriving spring migrant birds, or takes a weekend to check out insects in a mountain stream, or looks inside flowers to admire the marvelous ingenuities involved in pollination. The former tends to drag culture down to its lowest commonalities; the latter can lift us up in a sense of unity with all life. The Way of Natural History, edited by Thomas Lowe Fleischner and published by Trinity University Press (Texas)
