It was hard to pick just one Syfy original movie for this list. I almost went with ¿Mega Python vs. Gatoroid,¿ but trying to buy Debbie Gibson as an animal activist and Tiffany as a park ranger distracts from the evil. So instead, I went with this reptilian ruckus. I assume they were partially motivated to fight because people still don't know the difference between the two.
Screengrab via YouTube