I have the Brinsea EcoGlow and my ducks just love it. Cinnamon who is much bigger than Sugar doesn't seem to mind getting all squished under neath it. She just loves it. The two ducks cuddle up together under the ecoglow. I have to raise it up because Cinnamon is getting so big she lifts it up to get out of it. It is adjustable and I'm about to raise it to it's highest height. I'm so glad I got it.