Very importantly, the biodiversity of mature old growth forest is exceptionally distinct to a bunch of 20 year old (often single or few species) trees. Take par

Very importantly, the biodiversity of mature old growth forest is exceptionally distinct to a bunch of 20 year old (often single or few species) trees. Take parrots for example. Many rely on old trees with openings or hollows for nesting. Without sufficiently old trees, they literally can't live there. The growth of such critical habitat often takes 100+ years, whereas fungi, reptiles, orchids, insects, and bryophytes may never recover from clear-felling.