animals beetle bug bugs closeup croton plant insect insects krayker macro pest red redbug weevil animal black common fly fly grey housefly vector alien Fallopia japonica flower foreign invader invasive Japanese Knotweed natural nature nuisance plant weed bright delicate dragonfly green leaves predator rest resting transparent wings grasshopper hopper leaf monsoon wet carpet clover eire feed irland luck pest plant plain shamrock st. patricks weeds