We still have room for our Friday Afield: McGovern Park program on June 26 @ 2:00 pm – 4:00 pm. You can find more details here: www.wehrnaturecenter.com/event/friday-afield-mcgovern-park/It is also Pollinator Week and we want to do a little highlight on Monarch Caterpillars and Milkweed as the theme for this year is Life on a Leaf. 🌿Did you know that milkweed contains toxic compounds called cardenolides in the form of the sticky sap. When caterpillars eat the leaves, they store these toxins, making them poisonous and unpalatable to predators like birds. 🐦To bypass the sticky sap, larger (fifth instar) monarch caterpillars crawl to the main stem or the base of a leaf and sever the major veins. This depressurizes the leaf and stops the flow of sap to the tip. Once the flow is safely diverted, the caterpillar can eat the leaf without getting its mouth glued shut. 🦋
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Celebrate Pollinator Week June 22nd through June 28th! 🎉The 2026 theme this year is ""Life on a Leaf: Celebrating Host Plants." What is a host plant? Host plants are specific plants or groups of plants that an organism (most commonly a butterfly, moth, or other insect) relies on for food, shelter, and reproduction. Probably the most famous group of host plants are those are the many species of Milkweeds, which help support the Monarch Butterfly. 🦋In honor of "Life on a Leaf: Celebrating Host Plants we want to share a creature feature on the Fawn Sphinx Caterpillar as seen in the photo. They are native to Wisconsin and have been found in Milwaukee County. The caterpillar of the Fawn Sphinx (aka Laurel Sphinx) eats plants such as Laurel (Kalmia latifolia), lilac (Syringa vulgaris), fringe tree (Chionanthus virginicus), privet (Ligustrum), ash (Fraxinus), poplar (Populus), mountain holly (Nemopanthus mucronatus), and northern bush honeysuckle (Diervilla lonicera). Sphinx moths are also known as hawk moths because they are strong and fast fliers. They sometimes hover over flowers when sipping nectar; many fly in the late afternoon and are mistaken for small hummingbirds, and some night-flowering plants are pollinated by sphinx moths. Some sphinx moths are important pollinators of members of the Orchid family. The hornworms (as in the notorious Tomato hornworm) are Sphinx caterpillars. For the most part, every member of the Sphinx moth family will have a caudal horn as a caterpillar. Seeing a caterpillar with a horn on their hind end does NOT automatically make them a Tomato or Tobacco Hornworm, and are more often than not a friend and not a foe. One way we celebrate Pollinator Week is to learn more about our local pollinators, to support them by planting native plants, using fewer chemicals, and sharing with others what you have learned. You can find out more by visiting: www.pollinator.org/pollinator-week 📸: Wehr Nature Center#wehrnaturecenter #milwaukeecountyparks
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