Praying mantis predation on birds, a 'Harry Potter' spider, the lifeforms of the Pacific, and sea spiders use their guts to move oxygen rather than their blood.
https://www.earthtouchnews.com/natural- ... ing-birds/
https://www.livescience.com/59729-wolf- ... ragog.html
https://www.livescience.com/59755-big-p ... ansey.html
https://www.livescience.com/59745-big-p ... hotos.html
https://phys.org/news/2017-07-sea-spide ... earts.html
http://news.nationalgeographic.com/2017 ... egs-heart/
http://otlibrary.com/giant-sea-spider/