There may be many cases of co-adaptation between species, but we do not encounter them frequently.  This video clip is one sampled from the thousands (hundreds of thousands?) of hours that the BBC has invested in for the sake of it various nature programs. Because it is made available on Youtube, which has an intellectual property rights vetting process, it seems to be an example of the BBC’s generous contribution to the commons.

That makes the BBC worthy of special note.  Almost as worthy of note as the natural phenomena that this clip is representative of.  Is it altruism?  Co-adaptation of another form?