These images were taken a while ago, but they show some remarkable behaviour. These are Little Egrets and Little Black Cormorants hunting together in a shallow pool. I don't think there is any doubt that the individuals of each species are working together - and it looked very much like the two species were cooperating.
The cormorants would swim along, line abreast pushing (what I assume are) small fish in front of them. They would surface and turn in towards the shore, often with something in their beaks. The egrets rushed backwards and forwards, keeping level with the cormorants and picking off food the escaped - or was pushed towards the shore. All in all it was pretty remarkable - and a situation where I wished I had turned on the video!
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