オーストラリアの昆虫は、なぜこんなに大きいのか？

Credit:
Wheel bug: By Ian Grettenberger, CC BY 3.0: https://creativecommons.org/licenses/by/3.0, https://commons.wikimedia.org/wiki/File:Wheel_bug_assassin_bug_vs._silver-spotted_skipper_caterpillar.webm
CC BY 2.0 https://creativecommons.org/licenses/by/2.0:
By Mark Dumont:
Walking Stick: https://flic.kr/p/dXmBmu, https://commons.wikimedia.org/w/index.php?curid=25937625
Walking Stick 2: https://flic.kr/p/dXfWPF, https://commons.wikimedia.org/w/index.php?curid=25937624
CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/:
Australian Walking Stick: By Rosa Pineda, https://commons.wikimedia.org/w/index.php?curid=27718346
Dryococelus australis: By Peter Halasz, Pengo, WolfmanSF, https://commons.wikimedia.org/w/index.php?curid=13981580
stick insect: By Granitethighs, https://commons.wikimedia.org/w/index.php?curid=15476183
CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0:
Coscinocera hercules: By Anaxibia, https://commons.wikimedia.org/w/index.php?curid=58155004
Triboniophorus: By Stitchingbushwalker, https://commons.wikimedia.org/w/index.php?curid=87461697
Pink Slug: By KarlDaFrog, https://commons.wikimedia.org/w/index.php?curid=104894149
Kaputar: By Stitchingbushwalker, https://commons.wikimedia.org/w/index.php?curid=87197313
Kaputar 02: By Stitchingbushwalker, https://commons.wikimedia.org/w/index.php?curid=87461698
Theraphosa blondi: By Didier Descouens, https://commons.wikimedia.org/w/index.php?curid=49475716
giant wood moth: By John Robert McPherson, https://commons.wikimedia.org/w/index.php?curid=86283944
Endoxyla cinerea: By John Robert McPherson, https://commons.wikimedia.org/w/index.php?curid=86283943
Morphological Differences: By Alexander S. Mikheyev, Andreas Zwick, Michael J.L. Magrath, Miguel L. Grau, Lijun Qiu, You Ning Su, David Yeates, CC BY 4.0 https://creativecommons.org/licenses/by/4.0, https://commons.wikimedia.org/w/index.php?curid=63288216
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