appearance beak beaks blood-flow captive captivity Chinese-white-dolphin clever coastal-animals color coloration colored colorful colors colour coloured colourful colours confined conservation contrast contrasting dark-spots entertaining entertainment environment environmental Indo-Pacific-humpbacked-dolphin mammal marine-park medium-sized near-threatened oceanic perfoming performance pink pink-dolphins restricted skin Sousa-chinensis spots spotted teeth wild wildlife articulated barrel barrels chemical chemicals contaminate contamination corrode corrosion dioxin drum drums dump ecology garbage gas gasoline green industrial industry issue issues leak leakage lorry management metal oil petrochemical petrol poison poisonous pollute polluting pollution recycle refine refined refinery rust rusty seep seepage seeping semi spill stare storage substance technology toxic trailer transport transportation vehicle waste weirdvis activity beach churned-up conserving curved curving damage damaged damaging environmentally-unfriendly foot-prints grainy gray grey impressed impressions imprinted imprints indented light marked marks off-road-driving over-printed patterns prints rough safety sand soft-sand surface surfaced surfaces tangled terrain texture textured textures tire-tracks track tracks tyre-tracks vehicle-tracks vehicles brightly-coloured brown carpeting-plants clump-forming clumps common daisy-like drought-tolerant environmental-weed flower flowers garden-flowers gazania gazanias golden hardy introduced-species invasive low-growing perennial plants prolific rapid-spreader resilient roadside-weeds South-African streaked tough vivid water-wise weed widespread wind-blown-seeds winter yellow garden-escape lance-shaped-leaves