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A prominent green "TOILET" sign, featuring universally recognized male and female symbols, mounted on a dark wooden door.
Common Chiffchaff Sitting On Tree Branch Against A Blurred Background
Eurasian blackbird aka the common blackbird or turdus merula female is feeding her babies. Common bird in Czech republic in springtime.
Male Common Darter dragonfly, Sympetrum striolatum, Dumfries and Galloway, Scotland
Common Pochards showing behavior like flapping and floating on calm water. Photographed in Korea.

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