Spiders in flight

I have only seen spiders in flight twice in my life. The conditions have to be exactly right. These little spiders float on the air on a string of spider silk that is so light they float for hundreds of yards. Here in Australia gazillions move from one tree to another. The ones I have seen the spiders are about a millimeter in diameter. I think they are moving to new homes and spreading the gene pool by doing so. The silk threads are so fine that they cannot be photographed, This is an amazing time in the bush.