I believe that there are creatures still present in our time from way back in history. We just have not officially found them yet. Not necessarily the prehistoric era (although there
could be survivors
somewhere out there on our planet that we have yet to discover), but certainly from the times of, say, Native America.
Native Americans often depicted large birds in drawings and symbolising them on artefacts, such as drums and totem poles:
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Said to appear at the onset of severe thunderstorms, they were associated with being the deliverer of both life and death.
Zoologists today categorize Thunderbirds as mythical creatures. However, there is plenty of fossil evidence to prove that huge birds
did, at one time, fill our skies. Teratornis, a family of (so we believe) extinct birds of prey and of which, two species are actually known to have existed -
Teratornis Merriami and
Teratornis Woodburnensis, were common in both North and South America and had wingspans of between 12 and 18 feet. What if these birds are what Native Americans saw and recorded? And what
IF they are not actually as extinct as we thought they were?
Then you have
Argentavis. With a wingspan estimated at seven meters across, Argentavis were approximately twice the size of the largest flying bird today (which is the
Wandering Albatross), and only the long-extinct
pterosaurs could have rivalled and exceeded it in size.
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The problem is, though, these 'mammoths' of the sky rarely match the description of the Thunderbird as given by witnesses. And there have been a
lot of witnesses to these phenomena. Descriptions given of the Thunderbird are more leant towards some form of Pterosaur, but as we know (.....), they have been extinct for thousands of years.
In the conspiracy theorist world, we have to consider if some 'mad scientist' on some distant island has created their very own 'Jurassic Park', reverse engineering DNA to give life to living creatures from times gone and simply, one (or more than one) has escaped? Or, does this give credence to the 'hollow Earth' theory and these creatures have appeared from the depths of our very own planet?
From a paranormal standpoint, we have to consider thought forms, which I recently posted about. Could this phenomenon simply be a 'living creation' born of the human mind? Or are they somewhat related (and potential evidence?) to the theory of the 'block universe' where it is believed that the past, present and future actually coexist and through slips in the 'block', or portals opening, we catch glimpses of things that we deem as time-travellers (not all time-travellers have to be human under the 'block universe' theory)?
Whatever the reason behind the sightings, these creatures continue to baffle us, as do sightings of werewolves, Bigfoot and other cryptids that roam our plane of existence. There is so much about our Universe, and humanity itself, that we just do not understand nor can comprehend and, potentially, never will.