# Horned Nudibranch (*hermissenda crassicornis*) The Horned Nudibranch is a colorful sea slug that has beautiful, horn-like structures on its back. These unique creatures glide gracefully through the water, making them a fascinating sight for ocean explorers! - **Category:** [Invertebrate](https://www.snappit.app/explore/categories/invertebrate) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 5 - **Habitat:** They live in coastal waters along the Pacific Ocean, often found among sea anemones and coral. - **Also known as:** Horned Sea Slug, Nudie, Sea Butterfly ![Horned Nudibranch](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Nudibranchia_%283486753501%29.jpg&width=800) Photo: Minette Layne from Seattle, Washington, CC BY-SA 2.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Nudibranchia_%283486753501%29.jpg) ## Appearance The Horned Nudibranch has a translucent body often adorned with bright orange, white, and blue markings. Its back is covered in numerous 'horn-like' cerata, which are extensions for breathing and defense. Two feathery rhinophores sprout from its head, resembling antennae. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Mollusca - **Class:** Gastropoda - **Order:** Nudibranchia - **Family:** Myrrhinidae - **Genus:** Hermissenda ## Interesting facts - Despite their slug-like appearance, they are fierce predators of small ocean creatures! - Horned Nudibranchs lay their tiny eggs in beautiful, spiral-shaped ribbons! - Nudibranch means 'naked gills' because their breathing parts are often exposed! - They are hermaphrodites, meaning each individual has both male and female parts! ## Special abilities - **Sting Stealer:** Horned Nudibranch can steal stinging cells from hydroids and anemones, using them for its own amazing defense! - **Body Dropper:** Horned Nudibranch can drop its 'horns' (cerata) when threatened, helping it escape hungry predators! - **Chemical Sensor:** Horned Nudibranch has special rhinophores that help it 'smell' for food and danger in the water. ## Measurements & details - **Length:** up to 10 cm - **Maximum Depth:** 30 m - **Average Lifespan Months:** 12 months - **Minimum Depth Meters:** 0 m ## Diet & Feeding These sea slugs are tiny hunters, eating small critters like hydroids and sea anemones! - **Primary Foods:** Hydroids, Sea anemones, Other nudibranchs, Small crustaceans - **Foraging Method:** Foraging ## Ecological connections - **Eats:** Sea Fur Hydroid (*Obelia geniculata*) — A primary food source. - **Eats:** Aggregating Anemone (*Anthopleura elegantissima*) — Consumes these anemones. - **Eaten by:** Six-rayed Sea Star (*Leptasterias hexactis*) — Can be prey for sea stars. ## Traits - [Solitary](https://www.snappit.app/explore/traits/solitary): Solitary animals live alone for most of their lives, only interacting with others for mating or parental care. - [Colorful](https://www.snappit.app/explore/traits/colorful): Colorful describes organisms or objects displaying a wide range of bright and distinct colors. - [Carnivorous](https://www.snappit.app/explore/traits/carnivorous): This trait identifies organisms whose diet consists entirely or primarily of animal tissue. - [Aquatic](https://www.snappit.app/explore/traits/aquatic): Aquatic habitats encompass environments where organisms live predominantly in water, including oceans, rivers, lakes, and wetlands. - [Marine](https://www.snappit.app/explore/traits/marine): Marine habitats encompass all saltwater environments of the Earth's oceans, supporting an immense diversity of aquatic life. ## Collections - [Invertebrates](https://www.snappit.app/explore/collections/invertebrates) ## Safety **Danger:** 1/5 · Very low No special safety notes yet. ## Frequently Asked Questions ### How to identify Horned Nudibranch? Look for fins, arms, tentacles, shells and body symmetry. Underwater light shifts colors, so structure and markings usually matter more than shade. Sea Creature Identifier: upload a photo and compare the visible details. ### How long is Horned Nudibranch? up to 10 cm ### What does Horned Nudibranch eat? These sea slugs are tiny hunters, eating small critters like hydroids and sea anemones! ### Where is Horned Nudibranch usually found? They live in coastal waters along the Pacific Ocean, often found among sea anemones and coral. ### How does Horned Nudibranch hunt? Foraging ### How deep can Horned Nudibranch go? 30 m ### What is the average Lifespan Months of Horned Nudibranch? 12 months ### What is the minimum Depth Meters of Horned Nudibranch? 0 m ## Where to spot - [Pike Place Market](https://www.snappit.app/guides/places/pike-place-market) — Washington, US · Historic District - [East Park](https://www.snappit.app/guides/places/east-park) — Washington, US · Park - [Mendocino and Headlands Historic District](https://www.snappit.app/guides/places/mendocino-and-headlands-historic-district) — US · Historic District - [Mission Santa Cruz](https://www.snappit.app/guides/places/mission-santa-cruz) — California, US · Historic Site - [Schmitz Park](https://www.snappit.app/guides/places/schmitz-park) — Washington, US · Nature Reserve - [Jarstad Park](https://www.snappit.app/guides/places/jarstad-park) — Washington, US · Park [View all places to see Horned Nudibranch](https://www.snappit.app/guides/where-to-see/horned-nudibranch) ## More Invertebrate - [Coral](https://www.snappit.app/explore/coral) - [Crab Spider](https://www.snappit.app/explore/crab-spider) (*Mecaphesa asperata*) - [Garden Spider](https://www.snappit.app/explore/garden-spider) (*Araneus diadematus*) - [Brown Recluse Spider](https://www.snappit.app/explore/brown-recluse-spider) (*Loxosceles reclusa*) --- Source: [Horned Nudibranch: Facts & Places to See — Snappit](https://www.snappit.app/explore/horned-nudibranch)