On 2 January 2014, children, their parents and grandparents went to Ecomare museum on Texel island in the Netherlands. There, they helped biologists doing research on owl pellets.
Surprisingly, a child discovered frog bones in one pellet. Barn owls hunt in the dark, seeing the body heat of their prey with infrared light. Frogs, being cold-blooded, don’t show body heat; making it hard for owls to find them. The owl may have found the frog accidentally.
Fifteen bird bones were found. Owls don’t often eat birds. Maybe more bird bones than usually there, because of the cold 2013 spring?