The Editors would like to credit the following photographers and researchers for their photographs on the cover of this special issue:
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(Photographer credit; Researcher credit)
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Adam and David Tarnoki©; Adam and David Tarnoki
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Andre Tan, Murdoch Childrens Research Institute, Heidi Wagner, Karin Allen, Vicki Kouts and Zaina Nehme©; Jeffrey Craig and Richard Saffery
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Carlos Valiante©; Kathryn Lemery-Chalfant
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Coral Pink©; William Coventry
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Ellie Grant-Taylor©; Nick Martin
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Frederic Volkringer©; Juan R. Ordoñana
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Gillian Wilson©; Svetlana Glinianaia
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Ilona Davies©; Corinna Bennett
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Lisabeth F. DiLalla©; Lisabeth F. DiLalla
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Nancy Segal©; Nancy Segal
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Natascha Stroo©; Natascha Stroo
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Sabrina Alriti, Franca D'Angelo and Belocchi©; Sonia Bresciani
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Scott Bramwell©; Gary E. Swan
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Sevgi Oncel©; Fazil Aliev
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Shouko Taguchi and Chieko Temba©; Syuichi Ooki
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Takayuki Fukudu©; Kazuo Hayakawa
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Usa Duangvao©; Somsong Nanakorn
The Editors would also like to gratefully acknowledge all the twins who appear in the images on the cover of this special issue.