Voikainidae

Voikainidae is a proposed family of extinct birds. The family was first described in 2019 based on fossil remains found in the Eocene epoch deposits of Messel Pit in Germany. The type genus is Voikainia. These fossils represent some of the earliest known bird families from the Paleogene period.

The extinct birds assigned to Voikainidae are characterized by several unique anatomical features, particularly in their skeletal structure. These include specific details of the skull, pelvis, and limb bones, which distinguish them from other known avian groups. The fossil evidence suggests they were likely arboreal, meaning they lived in trees, based on adaptations in their feet and legs.

The phylogenetic placement of Voikainidae has been a subject of study, with initial analyses suggesting a possible relationship to modern passeriform birds, though this is not definitively established. The discovery of Voikainidae contributes to our understanding of avian evolution during the Paleogene, a critical period following the Cretaceous-Paleogene extinction event. Further research and new fossil discoveries will be crucial in clarifying the exact evolutionary relationships and ecological role of this extinct family. The limited fossil record currently means that much about their biology, behavior, and diversity remains speculative.