# Alder Leaf Beetle (*Agelastica alni*) The Alder Leaf Beetle is a small, shiny insect that loves to munch on alder tree leaves. They are often found in groups and can be seen during the warm months, making them fun to spot in nature! - **Category:** [Insects](https://www.snappit.app/explore/categories/insect) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Habitat:** Forests ![Alder Leaf Beetle](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Agelastica_alni_%28aka%29.jpg&width=800) Photo: André Karwath aka Aka, CC BY-SA 2.5 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Agelastica_alni_%28aka%29.jpg) ## Appearance The Alder Leaf Beetle is a small, oval-shaped insect, distinctively metallic blue-black, sometimes with a greenish sheen. Its shiny, dark exoskeleton helps it stand out against green leaves. Its head and thorax are also the same glossy dark color. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Arthropoda - **Class:** Insecta - **Order:** Coleoptera - **Family:** Chrysomelidae - **Genus:** Agelastica ## Interesting facts - Adult Alder Leaf Beetles spend their whole lives near alder trees, rarely venturing far from their favorite food. - Their babies, called larvae, look like tiny black slugs and munch leaves even more than adults! - These beetles can completely strip an alder tree of its leaves, turning green trees bare! - They lay their bright orange eggs in clusters on the underside of alder leaves, hiding them from view. ## Special abilities - **Chemical Shield:** Alder Leaf Beetle can secrete a yellow, toxic fluid from its leg joints because this reflex bleeding helps deter hungry predators. - **Leaf Muncher:** Alder Leaf Beetle has specialized mouthparts that help it chew through tough alder leaves, making them its primary food source. - **Winter Nap:** Alder Leaf Beetle can survive cold winters by burrowing into leaf litter or soil, which helps them emerge in spring. ## Measurements & details - **Wingspan:** 12-14 mm - **Size:** 6-7 mm - **Lifespan:** 60-120 days - **Leg Count:** 6 ## Diet & Feeding These beetles munch on delicious alder leaves, both as larvae and adults! - **Age differences:** Both larvae and adults exclusively feed on the leaves of alder trees. - **Primary Foods:** Alder leaves, Hazel leaves, Birch leaves - **Foraging Method:** Foraging ## Ecological connections - **Eats:** Common Alder (*Alnus glutinosa*) — Feeds on leaves, sometimes causing defoliation. - **Eaten by:** [Great Tit](https://www.snappit.app/explore/great-tit) (*Parus major*) — Common bird predator of insects, including beetles. - **Eaten by:** European Garden Spider (*Araneus diadematus*) — Spiders prey on various insects found on foliage. ## Traits - [Social](https://www.snappit.app/explore/traits/social): Social animals live in organized groups, cooperating for survival benefits such as foraging, defense, and raising offspring. - [Camouflaged](https://www.snappit.app/explore/traits/camouflaged): Camouflaged describes organisms that possess coloring or patterns that allow them to blend into their environment. - [Colorful](https://www.snappit.app/explore/traits/colorful): Colorful describes organisms or objects displaying a wide range of bright and distinct colors. - [Herbivorous](https://www.snappit.app/explore/traits/herbivorous): This trait characterizes organisms whose diet consists entirely or primarily of plant material. - [Forest](https://www.snappit.app/explore/traits/forest): Forest habitats are terrestrial environments dominated by dense tree cover, supporting a high diversity of plant and animal life. - [Diurnal](https://www.snappit.app/explore/traits/diurnal): Diurnal animals are primarily active during daylight hours, typically resting or sleeping at night. - [Pollinator](https://www.snappit.app/explore/traits/pollinator): Describes organisms that transfer pollen, enabling the fertilization and reproduction of plants. ## Collections - [Insects](https://www.snappit.app/explore/collections/insects) ## Safety **Danger:** 1/5 · Very low These beetles are safe to observe, but it's best not to touch them. ## Frequently Asked Questions ### How to identify Alder Leaf Beetle? Look for hard wing covers meeting in a line down the back, then compare the antennae, body shape, legs and markings. Metallic colors shift a lot with lighting. Beetle Identifier: upload a photo and compare the visible details. ### What is Alder Leaf Beetle's wingspan? 12-14 mm ### How big is Alder Leaf Beetle? 6-7 mm ### How long does Alder Leaf Beetle live? 60-120 days ### What does Alder Leaf Beetle eat? These beetles munch on delicious alder leaves, both as larvae and adults! ### Where is Alder Leaf Beetle usually found? Forests ### How does Alder Leaf Beetle hunt? Foraging ### How many legs does Alder Leaf Beetle have? 6 ## Where to spot - [Knowsley Safari Park](https://www.snappit.app/guides/places/knowsley-safari-park) — England, GB · Zoo ## More Insects - [Common Eastern Bumble Bee](https://www.snappit.app/explore/common-eastern-bumble-bee) (*Bombus impatiens*) - [Spotted Lanternfly](https://www.snappit.app/explore/spotted-lanternfly) (*Lycorma delicatula*) - [Brown-belted Bumble Bee](https://www.snappit.app/explore/brown-belted-bumble-bee) (*Bombus griseocollis*) - [Eastern Carpenter Bee](https://www.snappit.app/explore/eastern-carpenter-bee) (*Xylocopa virginica*) --- Source: [Alder Leaf Beetle: Facts & Places to See — Snappit](https://www.snappit.app/explore/alder-leaf-beetle)