Image Gallery What Do Monarch Larvae Do? Slideshow |
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Elizabeth Howard |
Karen Oberhauser |
Bud Hensley |
Eat Monarch caterpillars eat voraciously. Find the two larvae in the photo. One is 2,000 times larger than the other. A monarch larva can grow this much in about two weeks, depending on temperatures. |
Grow Monarch caterpillars grow through five stages as a larva. Each stage is called an instar. The smallest stage is the 1st instar. As the larva grows it goes through the 2nd, 3rd, 4th and 5th instars. After that, the larva becomes a chrysalis. |
Molt This monarch larva just shed its exoskeleton and is now eating the remaining portion, called the exuvia. A monarch must shed its exoskeleton to make room for growth. The process of shedding is called molting and happens between each instar. The most likely reason for eating the exuvia is to recycle the nutrients it contains, especially hard-to-get nutrients like nitrogen. |
Elizabeth Howard |
Elizabeth Howard |
Beth Rice |
Breathe
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Walk and Grip Monarch larvae have two different kinds of legs, true and false. Like all insects, the caterpillars have six true legs. They are attached to the thorax. The false legs, or prolegs, are attached to the abdomen and are only present during the caterpillar stage. False legs have pads at the ends with sticky hooks called crochets. When you hold a caterpillar, you can feel the grip of the crochets. Crawling along a paper-thin leaf, or eating while hanging upside down, monarch caterpillars defy gravity. |
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