I may have gone on before about the sheer fecundity of the flora and fauna here (unlike Britain where in comparison everything has to be coaxed from the ground and nursemaided into adulthood; and where the animal and insect life is almost totally benign).
Everything here is bigger, brighter, glossier, more dangerous (I won't even get onto sharks or crocs). Ordinary butterflies are three times the size, spiders are terrifying large - although in this case the dangerous ones tend to be at the boring end* - and birds are just more full on all around. This sign warns of the reality that, when it has young (luckily a time of year we are now past) it will most certainly attack you, even peck holes in you. Particularly, it seems, if you are on a bicycle.
* trigger alert: someone thought it was amusing to make the spider illustrations on this website jump about unexpectedly.