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DIGITAL CREDITS | COVER: DESIGN PICS INC/ALAMY STOCK PHOTO. TOC: (BACKGROUND) IMAGE SOURCE RF/A@WHIT RICHARDSON/GETTY IMAGES; (BUTTERFLY) LETIAN D/500PX/GETTY IMAGES; (HIPPOPOTAMUS) ROBCOTTIE/ISTOCK/GETTY IMAGES; (BOY) ESB PROFESSIONAL/SHUTTERSTOCK. A BUTTERFLY IS BORN: (BUTTERFLY & ORANGE FLOWER)) LETIAN D/500PX/GETTY IMAGES; (BUTTERFLY & PINK FLOWER) RYAN FULLERTON/EYEEM/GETTY IMAGES; (CATERPILLAR ON LEAF) © THOMAS KITCHIN & VICTORIA HURST/LEESONPHOTO/ALL RIGHTS RESERVED; (EGG) © DOUG WECHSLER/NPL/MINDEN PICTURES; (VIDEO CATERPILLAR EATING) SCOTT CAMAZINE/PHOTOLIBRARY/GETTY IMAGES; (VIDEO CATERPILLER CHRYSALIS) JAMESBENET/POND5; (CHRYSALIS) DON JOHNSON/AGE FOTOSTOCK/GETTY IMAGES; (PUPA) KENNETH M HIGHFILL/SCIENCE SOURCE/GETTY IMAGES; (EMERGING BUTTERFLY) KITCHIN & HURST/FIRST LIGHT/ AGE FOTOSTOCK; (VIDEO BUTTERFLY EMERGING) NEIL BROMHALL/OXFORD SCIENTIFIC VIDEO/GETTY IMAGES; (BUTTERFLY FLYING) WSMAHAR/E+/GETTY IMAGES; (VIDEO EGG TO BUTTERFLY) NATIONAL GEOGRAPHIC. MUD IS COOL: (HIPPOPOTAMUS) ROBCOTTIE/ISTOCK/GETTY IMAGES; (MUD ILLUSTRATIONS) ROI AND ROI/SHUTTERSTOCK; (WARTHOG WITH MUD & GRASS) MARTYN COLBECK/OXFORD SCIENTIFIC/GETTY IMAGES; (WARTHOG IN MUD) AUSCAPE UNIVERSAL IMAGES GROUP/GETTY IMAGES; (CAPE BUFFALO) MORGAN TRIMBLE ROYALTY-FREE/GETTY IMAGES; (RHINOCEROS) ANN & STEVE TOON/ROBERTHARDING/GETTY IMAGES; (ELEPHANTS) J. SNEESBY/B. WILKINS/THE IMAGE BANK; (MUD BACKGROUND) BOYDZ1980/SHUTTERSTOCK. MAKING USE OF MUD: (MUD BACKGROUND) BOYDZ1980/SHUTTERSTOCK; (WARTHOG) FLPA/JURGEN & CHRISTINE SOHNS/AGE FOTOSTOCK; (RHINOCEROS) MARTIN HARVEY/PHOTOLIBRARY/GETTY IMAGES; (BUTTERFLIES) © FRITZ POLKING/FLPA/MINDEN PICTURES; (BIRD) © SEBASTIAN KENNERKNECHT/MINDEN PICTURES; (CRAB) RICARDO LIMA/MOMENT/GETTY IMAGES; (CRANE WITH MUD) © STEVE GETTLE/MINDEN PICTURES; (CRANE INSET) © YVA MOMATIUK & JOHN EASTCOTT/MINDEN PICTURES. WE NEED EARTH: (BOY & GLOBE) ESB PROFESSIONAL/SHUTTERSTOCK; (RIVER) © SCOTLAND: THE BIG PICTURE/NATUREPL.COM; (FARMHOUSE) BARRETT & MACKAY/ALL CANADA PHOTOS/AGE FOTOSTOCK; (HOT-AIR BALLOONS) JAN WLODARCZYK/ALAMY STOCK PHOTO; (PLANET EARTH) NASA/NOAA/GOES PROJECT; (GLOBE) KAK2S/SHUTTERSTOCK;(KIDS & GLOBE VIDEO) WAVEBREAK_VIDEO/POND5. THE END: (WARTHOG) DESIGN PICS/SUPERSTOCK.