# Graceful Rock Crab (*metacarcinus gracilis*) The Graceful Rock Crab is a colorful creature that scuttles along the shore! With its hard shell and quick movements, it's a fun sight to see at the beach. - **Category:** [Invertebrate](https://www.snappit.app/explore/categories/invertebrate) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Habitat:** Coastal areas and rocky shorelines. - **Also known as:** Pacific Rock Crab, Shore Crab ![Graceful Rock Crab](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Cancergracilis.jpg&width=800) Photo: The original uploader was Harmonic at English Wikipedia ., CC BY-SA 2.5 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Cancergracilis.jpg) ## Appearance The Graceful Rock Crab has a flattened, fan-shaped carapace, typically orange-brown to reddish, often adorned with pale spots. Its long, slender legs and small, smooth claws distinguish it. It usually grows up to 10 cm wide. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Arthropoda - **Class:** Malacostraca - **Order:** Decapoda - **Family:** Cancridae - **Genus:** Metacarcinus ## Interesting facts - A crab's shell doesn't grow, so they shed it to get bigger! - Baby crabs, called zoea, look like tiny aliens, not like their parents! - Graceful Rock Crabs have eyes on stalks that can see almost all around them! - They use their small antennae to smell and feel their way around. ## Special abilities - **Limb Regeneration:** Graceful Rock Crab can regrow lost legs or claws, which helps them recover quickly from predator attacks or injuries. - **Agile Explorer:** Graceful Rock Crab has a streamlined body and nimble legs that help them scuttle quickly across rocks and navigate complex tide pools. - **Protective Armor:** Graceful Rock Crab has a hard exoskeleton that helps them protect their soft body from predators and harsh environments. ## Measurements & details - **Size:** 15 cm - **Size:** 8 cm - **Weight:** 100 g - **Lifespan:** 4 years ## Diet & Feeding This crab is an opportunistic omnivore, munching on tiny bits of plants and animals! - **Primary Foods:** Algae, Small invertebrates, Detritus, Scraps of fish - **Foraging Method:** Foraging ## Ecological connections - **Hunts:** [Sunflower sea star](https://www.snappit.app/explore/sunflower-sea-star) (*Pycnopodia helianthoides*) — A major predator of crabs. - **Eats:** [Sea otter](https://www.snappit.app/explore/sea-otter) (*Enhydra lutris*) — Crabs are part of their varied diet. - **Eaten by:** California mussel (*Mytilus californianus*) — Graceful Rock Crabs will forage on them. ## 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. - [Colorful](https://www.snappit.app/explore/traits/colorful): Colorful describes organisms or objects displaying a wide range of bright and distinct colors. - [Coastal](https://www.snappit.app/explore/traits/coastal): Coastal habitats are dynamic environments located along the interface between land and sea, influenced by tides, waves, and saltwater. - [Carnivorous](https://www.snappit.app/explore/traits/carnivorous): This trait identifies organisms whose diet consists entirely or primarily of animal tissue. - [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 Always watch crabs from a distance to avoid pinching! ## Frequently Asked Questions ### How to identify Graceful Rock Crab? 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 big is Graceful Rock Crab? 15 cm ### How much does Graceful Rock Crab weigh? 100 g ### How long does Graceful Rock Crab live? 4 years ### What does Graceful Rock Crab eat? This crab is an opportunistic omnivore, munching on tiny bits of plants and animals! ### Where is Graceful Rock Crab usually found? Coastal areas and rocky shorelines. ### How does Graceful Rock Crab hunt? Foraging ## Where to spot - [Gabriola Sands Provincial Park](https://www.snappit.app/guides/places/gabriola-sands-provincial-park) — British Columbia, CA · State Park - [Stephenson Canyon Community Greenway](https://www.snappit.app/guides/places/stephenson-canyon-community-greenway) — Washington, US · Park ## 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: [Graceful Rock Crab: Facts & Places to See — Snappit](https://www.snappit.app/explore/graceful-rock-crab)