attract-prey attracted attraction carnivore carnivorous carnivorous-plants clumps clusters coloring colors colouring colours cover devour digest digested digesting display distinctive edge edges enzymes flora flowers funnel herbaceous insect-trap insects nectar-like-secretions nutrient-source nutrients operculum passive-trap perennials pitcher-plants pitchers pitfall-traps plants prey proteases rims slippery species trap unusual variations variety vegetation veins appearance balate brine bêche-de-mer displayed echinoderms edible elongated fish market food for sale harvested holothurian home cooking human consumption leathery marine animals market medicinal medicine ready for purchase rubbery scavengers sea cucumbers sea food selection shapes shopping Sizes skin slimy smell surface textured textures tough trepang varieties water wet wet market worm-like claws cold-blooded eyes lizard quick reptile scales Skink small smooth swift calcium carbonate coiled coiled shells crawling exoskeleton eye stalks friction garden snail gastropoda helix aspersa herbivorous land snails locomotion logarithmic spiral mantle mollusk movement mucus muscular foot olfactory organs ommatophores radula retractable retracting ripple rippling shell Slime snail spirally tentacles terrestrial snails textured surface unsegmented