Swans can sleep with one eye open. This is a survival mechanism in which one half of the brain sleeps and the other half stays awake, keeping the swan vigilant for danger. Swans, like many other birds, can even do this while flying.
Gewoon heerlijk bezig zijn met fotografie en delen met iedereen die mijn foto's leuk vind... Read more…
Netherlands
Netherlands
Germany
Germany
Netherlands
Netherlands
Germany
Netherlands
Netherlands
Netherlands
Netherlands
Germany