Capuchin Monkeys, Costa Rica

Saw these guys while on a boat tour. They were minding theier own business, eating and such. Until a rival troupe showed up on the opposite side of the river. Which is why some of them are showing aggression. We could see I think 10 but there may have been more that we just couldnt see.

Pretty sure this guy is the Alpha

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Ohh! In first two pictures, I feel that guy is really angry! :O
And last two pictures are really scary (Those teethes)! :O

Thank you for commenting.

I think the first guy might have "resting mean face" Our guide thinks he is the alpha male because of all the scars on his face. Likely hes been in many territory disputes, and a lot of fights.