Key Identification & Physical Traits
• Appearance: They are large, rounded, bulky beetles measuring between 11 to 23 mm in length. They feature a matte or slightly iridescent blue-black exoskeleton and thick, highly segmented antennae that resemble a tiny black string of pearls.
• Flightless Nature: Unlike most beetles, their wing casings (elytra) are completely fused together, making them entirely flightless.
• Specialized Feet: Their legs have wide, padded tarsi equipped with hundreds of tiny adhesion hairs, allowing them to easily climb smooth vertical surfaces.
The Famous Defense Mechanism
The common names "bloody-nosed beetle" and "blood spewer" come from its unique, chemical defense behavior known as reflex bleeding. When handled or threatened by predators, the beetle intentionally ruptures thin membranes in its mouth to exude a bright red-orange drop of hemolymph (insect blood). This liquid is foul-tasting, acidic, and highly effective at deterring predators like birds or small mammals.
Habitat, Diet, & Lifecycle
• Diet: Both adults and larvae are monophagous, feeding almost exclusively on plants in the bedstraw family (Galium), such as Lady's Bedstraw, Heath Bedstraw, and Cleavers (Goosegrass).
• Habitat: They are frequently found plodding along paths, coastal cliffs, grasslands, heathlands, and hedgerows.
• Activity: While adults can persist for over 14 months and are active from spring through autumn, they are predominantly nocturnal, choosing to hide beneath stones or moss during the day.
• Larvae: The larvae are thick, slow-moving grubs up to 20 mm long, sporting a unique metallic blue-black coloration.
