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Dollarphoto.com: Julija Sapic 8; 22; Goldencoinz 24
Dreamstime.com: Swisshippo 10; Onizuka 14; Vandenbroek29 16; Ababaka 18; Isselee 20;
Tsombosalexis 21; Outdoorsman 25; Aigarsr 26; Linncurrie 30; Carolyne 31; Jolijuli 33; Snap-
galleria 34; Domdeen 36; Parushin 37; Steveheap 38; Bormotov 39; Sloth92 40; Peternasty 41;
Corepics 42
PBWorks: 13
ExoTerra: 32
National Library of Medicine: 17
Newscom: Sara-Jane Poole 29
Shutterstock: Moments by Millineux 28