animal black bug closeup common fly fly grey housefly insect krayker macro pest red vector animals antenna antennae brilliant common blow-fly green Green bottle fly Lucilia sericata metallic necrotic wings bokeh background birds breadcrumbs brown buff Camouflage camouflaged climate-tolerant common common-pest contrast dark ever-expanding populations fauna gray house sparrows insect-eaters introduced-species Matthew 10:29 mottled Old-World-sparrows passer domesticus passerine-birds plump powerful-beaks prolific seed-eaters small social sparrow sparrows textures true-sparrows two-a-penny worldwide-distribution ever-expanding-populations house-sparrows Luke 12:6-7 Matthew 10:29-31 passer-domesticus pavement climate tolerant feeding paving annoyance appearance big-eyes bugs colors colours creature edge edges eyes flies hairy insects light reflection shadow shiny transparency transparent variety wet