This is a harbour porpoise video.
Harbour porpoise sounds: here.
Counting the breaths of wild porpoises reveals their revved-up metabolism. In Danish waters, these small cetaceans have metabolic rates more than double those of humans: here.
Harbour porpoise calves around the UK are carrying a more neurotoxic cocktail of PCBs than their mothers, as females unknowingly detoxify themselves by transferring the chemicals while feeding their young, new research reveals today: here.