In the season 1 episode Terra Nova, I'm a little confused as to how the descendants of the colonists came to think humans were a separate race. The explanation in the episode was something along the lines of the last thing they heard from their parents before they died was them arguing with humans over the communicator. How the hell did that conversation go? Did their parents really say something like "You gosh darn humans! You're killing us!" We even hear a snippet of their conversation and the word "human" was never mentioned as far as I recall. How does this make any sense?