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>In the case of the few modern birds that use larger mammals or reptiles for
>platforms, many do it to pick pests out of the flesh of their rider thereby
>performing a useful (symbiotic) service to the beast. Others use such
>platforms as lookout posts (so I have been told) and the "platform" gets
>nothing in return (commensalism) for the ride.
In the case of the "platforms" being used as lookout posts, they get in return
an "early warning system" from their riders, meaning if the riding birds are
away, there must be trouble around, or something of that sort...