Markham's storm petrel

Markham's storm petrel is a species of storm petrel in the family Hydrobatidae. An all-black to sooty brown seabird, Markham's storm petrel is difficult to differentiate from the black petrel "Procellaria parkinsoni" in life, and was once described as conspecific with, or biologically identical to, Tristram's storm petrel "Hydrobates tristrami".