At least that's how the first one strikes me. A snowy egret, I think, with a bad attitude. Mean claws, too.
We took a two hour boat ride on the estuary between Tamarindo and Playa Grande with a local guide, Gerardo Santana, who knows his stuff. Almost all of the waterway is undeveloped and wildlife is left to itself but for a few small tourist boats. At one point we went up a small side channel, pulled up to the shore and walked through the forest looking for howler monkeys.
The bird taking off is a great blue heron. My traveling companion and family naturalist tells me that the third is a yellow banded black heron. Not sure about that - the beaks are so different.
Oh, and not a good idea to take a swim here.