Some writers in the field of animal ethics have argued that there are compelling moral reasons to reduce the suffering of sentient individuals and that following this line of reasoning, humans should undertake interventions to reduce the suffering of wild animals;[12][13] they claim that because ecosystems are not sentient, that they consequently lack the capacity to care about biodiversity, while arguing that sentient animals do have interests in their welfare.[14] As a result, they argue that there are strong justifications for ecologists to shift their resources currently used for conservation biology, to welfare biology.[14][15] It has also been asserted that if one is to accept an obligation to undertake systematic and large-scale efforts to help wild animals, that this would first require several important questions to be answered and that large-scale actions should only be carried out after a long phase of successful small-scale trials.[16]