All photos are by the authors, except for the following:
Dr. H John Barnes, photo 1
Joseph Berger, Bugwood.org, photo 1
Whitney Cranshaw, Colorado State University, Bugwood.org, photos 1, 2, 3
Susan Ellis, Bugwood.org, photo 1
Susan E. Ellis, photos 1, 2, 3, 4, 5 left
Joanna Williamson, photos 1, 2
Nicholas Williamson, photo 1
bellass, photo 1
Carola Schubbel, photo 1
coco, photo 1
cynoclub, illustration 1
dschreiber29, photo 1
Erni, photo 1
Eugene Chernetsov, photo 1
eurobanks, photo 1
fnendzig, photo 1
FOTOALEM, photo 1
geejell, photo 1
godunk13, photo 1
Ivonne Wierink, photo 1
Jennifer, photo 1
johnsroad7, photo 1
jolanta20016, photo 1
Joseph Clemson, photo 1
Krugloff, photo 1
marina kuchenbecker, photo 1
Memed ÖZASLAN, photo 1
Moonborne, photo 1
nawawong, photo 1
nmelnychuk, photo 1
nosyrevy, photo 1
pilat666, photo 1
quadxeon, photo 1
schankz, photo 1
scphoto48, photo 1
Sergey Bogdanov, photo 1
sherjaca, photo 1
Stephanie Frey, photo 1
Svetlana Day, photo 1
Tony Campbell, photo 1
Victor Lauer, photo 1
Vidady, photo 1
wip-studio, photo 1
Used under a Creative Commons Attribution 2.0 Generic license
Edd Grant, photo 1
ilovebutter, photo 1
mellow cat, photo 1
normanack, photo 1
Used under a Creative Commons CC0 license
Beeki, photo 1
jnprice73, photo 1
Public Domain Pictures / 18042, photo 1
Ranva, photo 1
Used under a Creative Commons CC0 1.0 Universal Public Domain Dedication
AnRo002, photo 1
Used under a Creative Commons Attribution 2.0 Generic license
furtwangl, photo 1
Harry Rose, photo 1
Illustrations 1, 2, 3, and 4 are by Shannon Wheeler, tmcm.com; illustration 1 © blueringmedia / Adobe Stock.
All woodcut illustrations are by Hannah Litt.