What is easily forgotten is that scientists are frequently rejected as well. Unfortunately for them, it's usually not until their theories have been current for a few hundred years or so. Maybe fortunately, as they get to collect royalties the whole time ...
Anyways, here's a link to some of the fabulous beasts that, according to some, once existed upon the earth. According to others they still do, but that's a separate posting. In any event they've landed in the "rejected" section because their theories or illustrations are no longer taken seriously by mainstream science.
Link: http://www.strangescience.net/stmam2.htm (I've landed you on the "Mammals Page", but look around, there are links to Sea Monsters, Dinosaurs and Dragons, Birds and more. All with fabulous illustrations)
The rest of the site is worth a peek as well - Link: http://www.strangescience.net/