Gryphon,
Thanks, I know that was something like that, in my country we call them Guazú-birá (indian name). They live in very thick bush so it's impossible to stalk them, maybe the only way is walking the less possible and very slowly at evenings, it's a very difficult hunt and you must need many days in a good area for an opportunity, in northen argentina you've more chances and it's consider a very challenging hunt.

I've seen many times your pictures and they're great !!
Congrats.
LG