As part of my research on the effects of landscape quality on barn owl fitness, it became increasingly clear that we should look at the whole annual cycle. Therefore, we looked for a way to extend our research, which until then was mainly limited to the breeding season, to the whole annual cycle. Since the barn owls stay in the breeding area all year round and also visit the nest boxes outside the breeding season, the idea arose to equip the owls with transponder rings, which are then read as soon as the owl sits on a perch attached to the entrance hole of the nest box. At the same time, the perch serves as a scale so that the owl's body weight can be registered. With Raffael and Sam from Octanis I found ideal partners to develop this system.
Dr. Bettina Almasi, Swiss Ornithological Institute