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There is an animal,1 also, that is generated in the summer, which has its head always buried deep in the skill [of a beast], and so, living on its blood, swells to a large size. This is the only living creature that has no outlet2 for its food; hence, when it has overgorged itself, it bursts asunder, and thus its very aliment is made the cause of its death. This insect never breeds on beasts of burden, but is very commonly seen on oxen, and sometimes on dogs, which, indeed, are subject to every species of vermin. With sheep and goats, it is the only parasite. The thirst, too, for blood displayed by leeches, which we find in marshy waters, is no less singular; for these will thrust the entire head into the flesh in quest of it. There is a winged insect3 which peculiarly infests dogs, and more especially attacks them with its sting about the ears, where they are unable to defend themselves with their teeth.

1 He alludes to dog-ticks and ox-ticks, the Acarus ricinus of Linnæus, and the Acarus reduvius of Schrank.

2 In c. 32 he has said the same of the grasshopper, in relation to its drink.

3 A variety of the Cynips of Linnæus, which in vast numbers will sometimes adhere to the ears of dogs.

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