Dozens Of Mysterious Clay Faces Appear In Spanish City For Third Time In Three Years

Dozens of mysterious clay faces have appeared in a Spanish city wall after the unidentified artist first introduced the heads

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Female Hummingbirds Can Disguise Themselves As Males In Order To Avoid Being S3xually Harassed

Researchers studying the changes in the colour of hummingbird plumage have found that some females change their colours to appear

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