Psittaci is a zoonotic organism, meaning that it can be passed between different species -including between animals and humans.

Megabacteria is actually a yeast organism called Macrorhabdus ornithogaster, or avian gastric yeast.

There are many strains of adenovirus, and the vast majority are adapted for a specific host species so often cause subclinical disease, meaning illness may not be obvious. 

Herpes viruses belong to an enormous family of DNA viruses – there are over 100 different strains and they affect most species.