Yeppers. You may have to push them under then hold them there until the 'feel the heat', can take a few tries but once a few figure it out, the rest will follow.What's the best way to transition them? Just turn off the lamp and help them find it?
Definitely has a purpose, not just gradient of heat but body size clearance, seen it utilized many times. Especially this year when I had a 3 week age range of chicks.I also create a gradient in heat by making the front legs slightly higher than the back - it gives chicks an option of heat levels. It's feasible that it serves no purpose whatever, but it doesn't stop me messing around with it.