The real hybrids (the scientific kind, that is)

Did you hear the one about the lonely whale, wandering the oceans for the past 12 years, singing its unique song at 52 Hz?

Mark Liberman at Language Log (which I've been reading quite a bit lately) has an informative summary of a precedent for the lonely whale -- scientists presume it's a hybrid -- the hybrid songs of hybrid Gibbons. Did you know that of the Hominids, only Gibbons and human beings have pair bonding and singing?