All footage is produced and owned by Kas Koenraads and Arnold van den Burg or permitted to use from the legacy of photographer and owner Eddy Kuis, unless specified otherwise below.
Mark Zekhuis (Saxifraga) – photo: pine marten looking outside from tree cavity
Mark Zekhuis (Saxifraga) – photo: pine marten hanging on tree stem, just before entering tree cavity
Rick Middelbos – photo: European adder sunbathing in curled position
Rick Middelbos – video: European adder swallowing frog as prey
Scottish Owl Centre – photos Snowy owl in snow habitat & Pharaoh eagle-owl
Niels de Nijs – photos Rock ptarmigan & Little auck
Joachim Menzel – photo Glaucous gull