calcium carbonate coiled coiled shells crawling exoskeleton eye stalks eyes 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 skin Slime slimy snail spirally tentacles terrestrial snails textured surface unsegmented Australia Australian Australian-sleepy-lizard blue-tongue blue-tongued-skink bobtail bobtail-goanna bogeyes creature fauna goanna heavily-armored-body lizard mottled omnivore pinecone reptile scaly scaly-skin shingleback short-tailed Skink slow-moving stump-tailed-skink stumpy-tail tiliqua-rugosa tough-hide viviparous-skink wildlife blotches Camouflage carnivorous carnivorous reptile carrion eater color colored colors colour coloured colours egg-laying goanna fast fast-moving intelligent monitor lizard patterns powerful powerful tails and claws predatory race-horse goanna resilient rings scavenger scavenging speed speedy varanid varanid lizard varanus variations ananas ananas comosus bromeliaceae bromeliad fruit central core coalesced berries composite cultivars edible fibrous fresh fruit fused fruitlets Golden Yellow herbaceous juicy multiple fruit nanas ornamental pale yellow perennial plant pina pineapple pointed tip raw rough scale-like segments Segmented segments sharp spiky widespread