Monarch butterfly egg, SEM

Monarch butterfly egg, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Coloured scanning electron micrograph (SEM) of Monarch butterfly egg (Danaus plexippus) on a milkweed leaf. In two to five weeks of egg-laying a female will lay about 700 eggs. Generally, eggs hatch in 4 days, but cool temperatures delay hatching up to 12 days. Newly hatched caterpillars feed on milkweed, their sole source of food. Milkweed contains a poison that is harmless to monarchs, but which sickens predators. A caterpillar eventually attaches itself to a twig, sheds and forms a chrysalis from which an adult monarch butterfly emerges. An adult lives six weeks in summer but those that migrate can live six to nine months over winter. Magnification: x10 when shortest axis printed at 25 millimetres.

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Keywords: 20070c, apocynaceae, asclepiadaceae, asclepiadoideae, butterfly, case, colored, coloured, crown, danaus, egg, electron, false-colored, false-coloured, flower, insect, insects, invertebrate, invertebrates, lepidoptera, micrograph, milkweed, monarch, nymphalidae, plexippus, pollinator, scanning, sem

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