
I have noticed reference to "bluebottles" in many different context, but here on the coast they aren't an annoying little insect, rather they are a hazardous form of jelly fish that sometimes appear in numbers after a long spell of north-easterly breezes.
They have a lovely translucent blue "bubble" which keeps them afloat, and sails them before the breeze, but sadly for those who come in contact with them, they trail tentacles loaded with nasty stinging poison. While not fatal, the sting can range from uncomfortable to needing treatment in hospital.
When they are in numbers, they wash ashore in numbers.
Mooloolaba
Sunshine Coast Daily Photo - Australia