Fig. 4From: An assessment of the Cenozoic avifauna of Switzerland, with a description of two fossil owls (Aves, Strigiformes) a, b Birds from the Early Oligocene of the Glarner Fischschiefer, Engi, Switzerland. a Holotype of Protornis glarniensis von Meyer, 1844 (PIMUZ A/IV 37a). b Trogoniformes indet. (PIMUZ A/IV 39). c Remains of bird eggs (NMB U.M. 6538–45) from the Late Oligocene of Bannwil, Canton Berne. Scale bars 5 cmBack to article page