My two cents on the Aeryn & other Sebacean physiological debate as follows:

First--missed an ep or two--what are you talking about temperatures? Sebaceans can't regulate body temp, ie they're more cold-blooded than mammal? Odd... Or did I completely misread that?

Second--are Sebaceans supposed to be an offshoot of humans or just happen to look an awful lot like us?

Third--going on the second assumption (they only LOOK like us)then what you're looking at with the peraphyral nerve or whatever is that it evolved to serve a similar function as the human liver, not replace it. This is what happens with--I forgot the terms...oh, my profs would be ashamed!--two seperate & distinct species evolve in isolation from each other but fill the same ecological niche. (I guess that is why everyone on Star Trek looks like a human with a bad latex job...) Probably a bad analogy, but it'd be like seeing kangaroos as Australia's answer to European (or N. American) deer. I'm guessing that's what we're seeing with Sebaceans, that they look like humans simply because they happened to evolve along similar lines--and, of course, to make John's exile that much more...interesting.

I had another thought but it just scuddled off under the bed. I'll look for it later.

KP

PS I saw Pitch Black last week. Wonderful--no redeeming social value whatsoever, but a great popcorn movie. Hey, we like popcorn movies. And earlier post was right--sorry, blanked on name--Vin Diesel's character saves the movie, keeps it from just another lame Aliens rip-off and adds some interesting ideas to mentally gnaw on later.
Although--and maybe it was just me--but I thought the lens filters they used to simulate the bright three-sun day (orange) and some of the night filters (blue) were a bit annoying & kind of made it look like a cheap made-for-TV movie. Again, saved by a few good jump scenes and the dynamics of the main characters, but...anyone else feel the same?