Legends

Despite their widely different experiences, the various legends of the human ancestor species discovered regarding their interactions with the second wave races can generally be summarised into three categories.

1 Creation myths
We were taken from {place} by {race} to perform {task}

While the myths do not accurately identify where their place of origin was (Terra/Sol or a transplanted population) after so many generations it has been possible to determine this in a few cases such as {world with unique atmospheric tint}

An unusual variation of this myth among isolated populations of several worlds is that it was another (presumably a second wave) human ancestor species forcing them to perform specific tasks. This is especially surprising among those populations with no trace of mixed genetics such as {planet}.

While Man from Terra/Sol is the only species of Man that believes it evolved on their world, the population of {star} are unusual in that there has never been any creation myth discovered. Their historical belief was that time started with the founding of the "first villages"

2 Disappearance myths
The The most easily verified example of this myth is the "great fire" and "sky fire" myths of {lizard homeworld} with its numerous nuclear and kinetic strike craters
 * The {hero or god} led us in a great war/revolt against {race} which was successful until {retaliation}
 * We fled across the ocean/ice/desert to escape the {race} but none of them have been seen since {event}
 * We were cast out of paradise/heaven by the god {race} because {event}
 * {catastrophic event} occurred and the gods disappeared

3 Historic myths
{place} is sacred because {hero or god} lived/died there

{place} is evil because we were forced to work there performing {task}

{race} was cruel because {punishment}

Overlap with Terra/Sol
There are numerous theories about why specific legends are very similar to those of particular ancient Terra/Sol cultures thousands of years later but no specific confirmation has been discovered for any of them.

The judaeo-christian history of Moses is very closely duplicated by the creation myth of {system} substituting homo neanderthalenis for the egyptians and the ruined city of ?? for the pyramids.

Historical proofs
The removal of the Hyoid bone from base of tongue to stop speech seems to be the origin of vampirism legends among human ancestor species dominated by Bats