Edwin Giesbers / African olive pigeon (Columba arquatrix) portrait, captive

Hanne & Jens Eriksen / Olive pigeon (Columba arquatrix) in tree, Mahweet, Yemen

Hanne & Jens Eriksen / Olive pigeon (Columba arquatrix) Mahweet, Yemen

Julian Hume / Illustration of Mauritian birds. Mauritius pink pigeon (Nesoenas mayeri) (centre left); Mauritius fody (Foudia rubra) (centre right); Mauritius olive white-eye (Zosterops chloronothos) feeding on the...

Kim Taylor / White rock dove / Feral pigeon (Columba livia) in flight, carrying olive branch of peace, digital composite, Surrey, England