Pelagornis the Largest Sea Bird that ever Lived

The deep sea is seemingly very inhospitable to life with very low amounts of food available, high pressures and low temperatures. This is partly true because there is less life per square meter spread across the deep however, giant creatures are still able to evolve in these environments, so why is this?

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Sources:
https://www.science.org/content/artic...
https://www.pnas.org/doi/pdf/10.1073/...
https://www.researchgate.net/figure/L...
https://www.nature.com/articles/s4159...
https://markwitton-com.blogspot.com/2...