in how many years scientists find out an animal is extinct
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Answer:
They don’t always know for certain. They rely on, “Did you find evidence of it still around? Did you see one? Is there any evidence or indicators some are aound but we haven’t seen them? You don’t see them for a long time? Then we might want to consider them extinct.”
This is a big loophole. It leaves them open to surprises like discovering long thought dead animals reappearing because they were living in some cave unseen somewhere if you get my drift. They are aware of the loophole and do address it as a flaw with their system publicly.
It’s what pseudo-scientists trying to find bigfoot and the lockness rely on to defend their claims their creatures are real. Here’s the flaw with their defense too. Sometimes you can prove an animal can’t exist in the environment by simply observing and calculating everything in the environment available that can sustain such beasts. Sadly, there is no way for a long dead beast like lockness to survive in the environment according to the area. It can not survive. It would have to live somewhere else.
With bigfoot this is easy to disprove. We would discover the remains of the beast if it existed. People always found giant squid corpses. There have been no discovers except for hoaxes.
This is why we know dinosaurs are extinct. (I am talking about none avian grammar Nazis.) The current ecosystems can’t sustain them. We do not find any remains or hints they still exist. This is why we know they are gone.