It is no doubt technically possible to study metabolism and respiration of fishes during swimming at a constant rate, and of certain insects and birds during flight, and to obtain information similar to that obtained on man during work on a bicycle ergometer or a treadmill.
There can be little doubt that fishes swimming rapidly do not make respiratory movements at all, but obtain the necessary ventilation of the gills simply by opening the mouth.
Recognition of this kinship with the rest of the universe is necessary for understanding him, but his essential nature is defined by qualities found nowhere else, not by those he has in common with apes, fishes, trees, fire, or anything other than himself.
I have seen one shrike occupy himself for hours in sticking up on thorns, a number of small fishes that the fishermen had thrown on the shore. The fishes dried up and decayed.
The rumors of Frank Sinatra's violence and his ties to organized crime were such that journalists joked in print about me ending up in concrete boots and sleeping with the fishes if I proceeded to write his biography.