Is Taxidermy Inhumane?

I've been attempting research in to the ethics of taxidermy; is it mainly done using the bodies of roadkill and animals killed of other natural causes, or is there a sport for killing them simply to taxidermy. I don't know how to feel about it otherwise, as I am obviously against killing animals for sport.

However, it all seems to be very underground in terms of taxidermists explaining how they go about getting their animal bodies. I have emailed a few taxidermists in Leeds and requested a meeting with them to find out more and hopefully have a look at their individual works.

Here's one of the emails I have to sent to a professional taxidermist in Leeds. I'm still waiting for a reply...