Tardigrades

https://www.livescience.com/57985-tardigrade-facts.htm

https://www.huntingpa.com/deer_nutrition.html

https://www.americanscientist.org/article/tardigrades

https://www.businessinsider.com/animals-able-survive-extreme-cold-2016-4#5-red-flat-bark-beetles-3

http://www.guinnessworldrecords.com/world-records/highest-recorded-temperature/

https://www.livescience.com/62720-tardigrade-lifespan.html

https://www.amnh.org/explore/curriculum-collections/deep-sea-vents/pressure-in-the-deep-seas

https://www.mnn.com/earth-matters/animals/blogs/water-bears-the-nearly-indestructible-microscopic-animal-that-will-outla

https://emergency.cdc.gov/radiation/arsphysicianfactsheet.asp

https://www.popularmechanics.com/space/a11137/secrets-of-the-water-bear-the-only-animal-that-can-survive-in-space-17069978/

https://en.wikipedia.org/wiki/Vacuum

https://www.space.com/5817-creature-survives-naked-space.html

https://sun.iwu.edu/~tardisdp/tardigrade_facts.html

https://www.wired.com/2017/03/secret-crazy-tough-water-bear-finally-revealed/

https://en.wikipedia.org/wiki/Tardigrade

http://www.bbc.com/earth/story/20150313-the-toughest-animals-on-earth

https://www.nature.com/news/tardigrade-protein-helps-human-dna-withstand-radiation-1.20648
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/cryptobiosis

https://www.telegraph.co.uk/science/2017/07/14/worlds-indestructible-creature-tardigrade-will-alive-earth/