The three species most seriously affected by diclofenac are the oriental white-backed vulture (Gyps bengalensis), the long-billed vulture (Gyps indicus) and the slender-billed vulture (Gyps tenuirostris).
Some may be taxonomically unique the last representative of an otherwise extinct group of animals, like the duck-billed platypus or the long-beaked echidna while others may differ from each other only slightly.