Of course, it does not actually mimic a virus, but it can mimic scary poisonous creatures like a lion fish or a sea snake. Mimicry is not really new in nature, like when a fly has evolved to look like a bee, but this octopus can choose to suddenly mimic something, and then immediately change to something else. It is so very cool.
National Geographic “Mimic Octopus” https://www.nationalgeographic.com/animals/invertebrates/m/mimic-octopus/ last accessed 6. february 2021
Alger “The Mimic Octopus: Master of Disguise” https://www.nature.com/scitable/blog/accumulating-glitches/the_mimic_octopus_master_of/ published 28. october 2013, last accessed 6. february 2021