Honeybees move bellies, imitate stadium “wave” to evade predators

This is a behavior well-known in the Apis dorsata (the so-called Giant Honeybee) found in Asia.  I have personally observed this behavior among colonies of Apis dorsata when I visited India to attend a conference on social insects.   Although this may seem like a new and little-known phenomenon, it is actually quite common among insects that form groups.   See for example:  http://en.wikipedia.org/wiki/Social_caterpillars

Here is an excerpt from that article:  "It is generally thought that aposematic coloration is most effective in deterring predators when insects group together. Indeed, the most common mode of active defense among social caterpillars is aposematic display, often combined with synchronous body rearing, flicking, and “en masse” regurgitation of toxic or unpalatable chemicals. Studies indicate that the spread of alarm through colonies of social caterpillars is mediated largely by tactile and, possibly, visual cues. Caterpillars can detect the airborne sounds generated by the beating wings of flying wasps and flies and respond with rapidly jerking movements. Vibrational signals set up by the agitated caterpillars and propagated by the communal web would appear the most likely means of alerting the colony to danger."

We would call this behavior "self-organized" in that the propagation of the "wave" is probably mediated through the interactions of nearby neighbors.   For more on this, see our book, "Self-Organization in Biological Systems".