Leighton Photography & Imaging

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  • The Pacific banana slug (Ariolimax columbianus) is the world's second-largest terrestrial slug in the world and can grow up to 9.8 inches (25 cm) long. They live on the forest floors in the Pacific Northwest, and are most often seen cruising along the leaf litter or on decaying wood at a maximum speed of  6 1⁄2 inches (17 cm) per minute. Because they get moisture through their skin, banana slugs need a moist environment in order to survive, and the wet, mild climate of western Washington, Oregon and British Columbia meets that need perfectly. This one was found in a disturbed suburban park in Kent, Washington.
    Pacific Banana Slug
  • Banana slugs are highly variable in appearance, but most tend to be either a solid light to bright yellow (hence the name banana slug) or yellow with brown spots. Sometimes brown, green or even white ones are seen, and color can often an indicator of the slug's age, health, how moist or dry it is, or even can be a clue as to what it's been eating. The body structure of the banana slug is very simple. It has a "foot" that is used for locomotion in the same way terrestrial or aquatic snails move about. The "hump" part of the back is called the mantle, and has an opening on its right called a pneumostome that is a simple airway for the single lung that it uses for respiration. Their entire body is covered in a thick slime helps it retain moisture and aids in "sliding" through the forest. This one was found in a disturbed suburban park in Kent, Washington.
    Pacific Banana Slug-9.jpg
  • A solidly yellow Pacific banana slug slowly makes its way through the Hoh Rainforest on the western side of the Olympic Mountains.
    Pacific Banana Slug
  • All banana slugs have two pairs of tentacles. The upper pair is the largest, and they are used to detect light intensity or lack of light, much in the way our eyes do. The smaller pair is used to detect and differentiate smells., much in the way our noses do. For protection, both pairs of tentacles can be retracted inside the slug's body in case of danger. This one was found in a disturbed suburban park in Kent, Washington.
    Pacific Banana Slug
  • Working alongside mushrooms and other fungi, banana slugs are detritivores that help turn decaying matter into soil humus. They eat leaves, dead plant materials, moss, fungi, and animal droppings and help in the movement of nutrients throughout the forest and prefer mushrooms over other foods, much to the detriment of human mushroom foragers. Because slugs do not have teeth, food is broken down using its ribbon-like radula, which works like a millstone to grind food into smaller and smaller particles that are then ingested. This one was found in a disturbed suburban park in Kent, Washington.
    Pacific Banana Slug
  • A close-up of a Pacific banana slug in the Hoh Rain Forest on Washington's Olympic Peninsula on a chilly, yet rare sunny day.
    Pacific Banana Slug
  • Banana slugs are very common in the forests of the Pacific Northwest. This one was photographed climbing over a 100+ foot tree that had recently fallen over in the Hoh Rain Forest in the Olympic National Park.
    Pacific Banana Slug