I can be a danger to humans and animals. Some of us (not all) can produce neurotoxins and livertoxins. Most of the toxins need to be ingested to be toxic. Also, toxins are often produced a low concentrations and only ingestion of high amounts of us would lead have an acute effect on humans or animals.
Comments
Tree Lichen commented on :
No, Lichens are totally harmless. They may be of benefit to Humans by some of the metabolites they make. This is being investigated…
Small Red-eyed Damselfly commented on :
No I am harmless, on the contrary I brighten the places where I live, and humans enjoy watching me flying around