Yes, I have the typical red heat bulb. No teflon. I keep a thermometer in the cage to monitor temperature because our climate fluctuates. Based on the estimated age , everything I read said between 80-85 degrees was best. Temperature was 82 when this occured.
Came home from work, changed out thier water. Everyone was fine. I had 10 ducklings just brought home 2 days ago. Sat down next to the cage with my laptop to finish up some work and noticed the behavior change over about 20 minutes. Started with scratching, so I googled fleas on ducklings...