What is the black swan's listing on the IUCN red list? How is the Koala listed on the IUCN red list? What does WWF represent? Considering #3, is #2 in more dire straits than #1?
Swan
The WWF is an international organization that works for the preservation of animals. Black swans are designated as least concern species meaning they are not close to being endangered. Koalas are designated as  vulnerable to extinction—just a step above endangered.
large water bird
Would WWF be angrier if you killed koala instead of black swan?