eucaliptus flower

we have trilions of planted eucaliptus allover portugal,it's a plague,but on purpous,here whith the rain and humidity that we have it grow double faster than the endemic trees like oak's,etc...so one more problem of wildlife globalization,in my bird observations i remark that in the eucaliptus woods the variety of species decline dramactily,and the same whith the flora,eucaliptus protect then self's whith toxin's that pass to the soil and like that limited the plantes arround,the leaves are not digested by local animals,not even by the most part of insectes,only the polinaters(?) honeybees etc,profite whith it.but it's a lovely tree whith a magnificent smell and the honey from eucaliptus is very transparente and ligth,so there are allways a good side in every thing:-)