Pacific banana slugs (Gastropoda: Stylommatophora: Arionidae: Ariolimax columbianus) are one of the more impressive organisms to be found in the temperate rain forests of the Pacific Northwest. Inhabiting coastal conifer woodlands from southern Alaska to central California, these animals reach their highest concentration among the wet coast redwood forests of northern California. They’re particularly common at Redwood National and State Parks where these photos were taken.
As the second-largest terrestrial slug in the world Pacific banana slugs can reach lengths of up to ten inches (25 cm). They’re typically colored bright yellow with some brown spots, but they can also appear green, brown, or white. They’re called “banana slugs” not because they eat bananas (which are absent in their native range) but because their size and coloration makes them resemble bananas.