[seren]

I am not sure your comparison is apt. Strange things in the sky tend to be viewed by much more people than animals that are actively hiding in unexplored/hard to reach areas. I am totally ready to believe there are plenty of things we don't know about the deep sea for example.

[senjutsuka]

Um, but if this phenomenon is a creature why wouldnt it try to stay out of sight? Further if 'things in the sky' are easier to find why were the bird of paradise only recently discovered and recorded? Answer: because their rare and prefer locations that arent very occupied by humans.

Hell we have whole tribes we've only just discovered. If something doesnt want to be found, its not impossible for it to stay hidden.

[nitrogen]

These sound a lot like arguments from ignorance. "We don't know for sure, therefore it must be true!" The dash cam videos are an excellent counterargument. If someone is lucky enough to film an alien on grainy blurry film, why is nobody lucky enough to get one on an HD dashcam?