I'll pass on the Schefflera then. I have never seen a boston fern on a bad list, but if someone says they think they are poisonous to birds then I won't put them in with the bird. He has lots of grapevines to play on hanging from the ceiling. I just wanted to make the room a bit more natural looking.
I keep my plants very dry in the winter, I think I watered my bosten ferns three times the whole winter last year. The majority of my houseplants are cacti. I keep them totally dry from September until late March. The soil is very dry and would not be a good medium for mold spores. I test the soil moisture weekly to avoid root rot when I overwinter plants. I have grown Asper in the lab for many years (I was a microbiologist) so I understand the organism well. I am not concerned about having the potted plants in the house. As I am an avid gardener it is unreasonable to disinfect myself every time I dig in the dirt. Destroying my normal skin flora daily through the use of alcohol hand sanitizers or antibacterial soap is a good way to catch some pathogenic bacteria.
While I understand many individuals have lost their birds to Asper on this forum, I personally feel that people worry about microorganisms too much and over-sterilize the environment. To develop a healthy functioning immune system one must be exposed to pathogens. There is research linking the overly sterilized environments found in the western world to autoimmune disorders and asthma. Its called the Hygiene Hypothesis and was first put forth by David P. Strachan in 1989. Instead of worrying about pathogens in my home, I work to boost the immune system of myself and my pets by feeding high vitamin A foods, encouraging exercise and exposure to sunlight. I'm not saying that I let mold grow in my shower, never clean cages and leave raw chicken everywhere, but I'm not going to worry about my bird flying past a potted plant.
Please note I'm not trying to start an argument, I am just stating my reasons for placing my plants in my home with my pets.