advice alert appropriate-behavior appropriate-behaviour behave behavior behaviour birds black care careful caution communicate communication directions ducks fatal feed feeding food inform information informing message no-bread not-allowed not-permitted permission-denied prohibited prohibition red restricted restriction restrictions sign signage warning water-birds watrer-fowl white area attention banned boundaries boundary cigarettes communicating danger direction directive distinctive entrance environment health health-risk limits location no-smoking penalties penalty pollution shopping-center shopping-centre symbol thick thin unhealthy wording words announcement avoid be-careful beware concern crocodiles crocs dangerous no-swimming protect protection risk risks risky rules safety signs swimming unsafe warning-sign water aware awareness colors colours considerate consideration Dirt dirty garbage green limitations limited listen lookout rubbish unwanted waste waste-disposal watch-out 3-D eye-catching glassy plastic raised style surface surfaces surfacing tactile texture textured textures lettering semi-transparent surfaced