what views do critics have?
Put the needs of nature above those of humans, disregarding economic considerations and the interests of indigenous peoples and other traditional users of the land.
International Union for Conservation of Nature
It has been claimed that IUCN put the needs of nature above those of humans, disregarding economic considerations and the interests of indigenous peoples and other traditional users of the land. Until the 1980s IUCN favored the "Yellowstone Model’ of conservation which called for the removal of humans from protected areas. The expulsion of the Maasai people from Serengeti National Park and the Ngorongoro Conservation Area is perhaps the best known example of this approach.

This is linked to another criticism that has been directed at IUCN, namely that throughout its history it has mainly been ‘Northern focused’, i.e. had a West-European or North-American perspective on global conservation. 
what is a ruff? Medium-sized wading bird. where is it found? Marshes and wet meadows across northern Eurasia. what does it eat? Beetles, flies, crustaceans, spiders, etc. do they have a relationship with humans? Yes, formerly trapped for food in England. are there any efforts being made to conserve them? No, classified as "least concern". what do you mean classified as "least concern"? is there a list for this? It didn't approach the thresholds for the population decline criterion of the IUCN Red List. what does iucn stand for? International Union for Conservation of Nature when was it established? 5 October 1948 who are their members? States, government agencies, international NGOs, etc., who is the secretariat? UNANSWERABLE who provides their funding? Official Development Assistance budgets of bilateral and multilateral agencies.
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International Union for Conservation of Nature [SEP] Criticism
It has been claimed that IUCN put the needs of nature above those of humans, disregarding economic considerations and the interests of indigenous peoples and other traditional users of the land. Until the 1980s IUCN favored the "Yellowstone Model' of conservation which called for the removal of humans from protected areas. The expulsion of the Maasai people from Serengeti National Park and the Ngorongoro Conservation Area is perhaps the best known example of this approach. This is linked to another criticism that has been directed at IUCN, namely that throughout its history it has mainly been ‘Northern focused', i.e. had a West-European or North-American perspective on global conservation.