On: IBM Watson fires its own cancer-fighting ‘moonshot’

I'm legitimately stumped. Which large bird starts with 'O'? Or is it second from the top.. so an Ibis?

Ostrich?

I'm going to go sit in the corner and cry now.

Thanks!

Only one I thought of relates to baseball. Didn't think it was large.

Edit: for some reason ramchip I keep missing that one when the subject of birds comes up

Large is relative. I thought Owl, Osprey. Ostrich (another comment) is of course larger. Guess your answer depends on your training set.