Here's a very unusual pattern of behavior I noticed among nudibranchs of this particular species observed at Batangas, Philippines... this 'branch is facing the current, as though it's sniffing the water. I have seen this odd behavior a number of times on different dives over a long period of time. I only observed this particular species engaging in this behavior.

Scientists theorize this "opportunistic" behavior among certain nudibranchs is to catch food floating by, or to reach another footing should the surface they are currently "standing" on cast adrift.

Identification: Nembrotha chamberlaini
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