Can you tell the age of an owl by the size of its eyes?

No, the size of an owl's eyes does not necessarily indicate its age. An owl's eyes are large in proportion to its head size and are fixed in their sockets, so they cannot grow or change size as the owl ages. However, an owl's eye color can change as it matures, with younger owls often having darker eyes that lighten with age. Additionally, the size of an owl's pupils can vary based on lighting conditions and the bird's state of alertness, but this is not a reliable indicator of age. Other physical features such as feather coloration and patterns can be used to determine the species and sex of an owl, but age is generally determined by examining its feathers and bones or by observing its behavior and vocalizations.