As previously posted here, Arn and I were apparently swimming with Irwaddy Dolphins while in the Mekong with the village children.

Thanks to John Peterson (JP) for sending me the following:

"Fascinated with the river dolphins. Actually amazed. They have articulated necks where most dolphins have fused spines. This allows them side to side along with up and down movement. They have amazing sonar, as they use it more than most aquatic mammals for hunting and swimming in murky waters. ... Apparently they are worshipped by fishermen in the region. They actually 'Assist' in herding fish into their nets...."

Learn more about the Irwaddy dolphin here.