I think I was too hasty in calling these hawks "Great Black"....both photographed last summer in the Pantanal.
I am now inclined to think that they (this is a pair) are both dark morph of "Short-tailed"... the give-away being the small white "tuft" on the forehead of one of them..., and of course the very short tail.
Also leaning towards the first one being the male and the second one the female.
Am I correct ? Thank you all in advance.