2013 I sat on a chair in Australia, and saw some white filaments which made me suspicious. I turned the chair upside down and below there was a nest of redbacks. I saw many little baby redbacks, they have not enough venom to harm me. The mother was absent, of maybe hid from me. The adult redback is one very rare example of a deadly spider. But in reality check the statistics, almost no(!) Australians die by redbacks every year, because antidotes are very effective.
