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| | Flea - MSN Encarta |
 | | Adult fleas, which feed on the blood of their hosts, are surface parasites on the skin of humans and other mammals and, less often, on birds. |
 | | Adult fleas, which are slightly more than 0.3 cm (more than 0.1 in) long, have broad, rather flat bodies, short antennae, and piercing and sucking mouth parts; their eyes are either minute or absent. |
 | | The dog flea and the cat flea are two of the most common species, both of which are parasites also on human beings, poultry, and livestock. |
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