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environnement (18) Nature and nurture (18) Euthenics (18) Ecology (18) Adaptation (Biology) (18) Appraisers (16) conservation (14) Conservation (14) Trust (12) fertilité du sol (11) Soil fertility (11) Agriculture (9) société (humaine) (8) protection des oiseaux (8) lutte antiparasitaire (8) ornithologie (8) Pests--Control (8) Ornithology (8) Human ecology--Study and teaching (8) British (8) Birds (8) Amphibians (8) oiseau (7) forêt (7) Bats (7) Introduced organisms (7) oiseau (7) recherche (6) aliment (6) Food (6)