CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Female tick laying eggs. The tick is larger than its normal size as it is swollen with a blood meal as it feeds while attached to the skin of its mammalian host. Hundreds to thousands of eggs (not seen) can be laid by a single female tick. The life stages of a tick are: egg, larva, nymph and adult. Ticks (superfamily: Ixodoidea) are small arachnids. They are ectoparasites, feeding on the blood of mammals (including humans), birds, and occasionally reptiles and amphibians. Ticks transmit several diseases, including Lyme disease, Colorado tick fever, and relapsing fever.
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