close-up of anti bird spike on cement floor

animal invertebrate leaf insect snow winter soil wood branch wildlife wing frost freezing ice sand iron twig water close-up bird spike cement floor birds droppings poop abstract architecture background balcony building city concept concrete control copy space detail dirty disease environment exterior focus installation interior metal nail natural needle nest outdoor pattern pest pigeon population prevent prevention problem protect protection repellent safety security sharp stainless steel stop structure surface texture trap urban wire