As regards their instincts and capabilities, the nocturnal Goatsuckers are far behind the diurnal members of their family, and exhibit so little sense of self-preservation, as constantly to expose themselves to great danger. We have frequently, whilst camping out in Africa, whenever we have kindled a fire, been visited by numbers of these birds, apparently quite regardless of the risk they ran of being brought down by our gun. In Spain, however, the Goatsuckers appear to be somewhat more on the alert; indeed, owing to their supposed dexterity in evading pursuit, they are there called by the peasantry _Engaña Pastor_, or "Shepherd Deceivers," as that class of men come most in contact with these birds, whilst tending their flocks; not from the absurd reason that has obtained such universal credence, but because these much-maligned visitants perform a most invaluable service both to the farmer and his cattle. "When the moon shines brightly," Waterton continues, "you may have a fair opportunity of examining the Goatsucker; you will see it close by the cows, goats, and sheep, jumping up every now and then under their bellies. Approach a little nearer; he is not shy; 'he fears no danger, for he knows no sin.' See how the nocturnal flies are tormenting the poor kine, and with what dexterity he springs up and catches them, as fast as they alight on the belly, legs, and udders of the poor animals. Observe how quietly they stand, and how sensible they seem of his good offices; for they neither strike at him, nor try to drive him away as an uncivil intruder. Were you to dissect him, and inspect his stomach, you would find no milk there; it is full of the flies that have been annoying the herd." [Illustration: THE OIL BIRD (_Steatornis Caripensis_).]