I don't think that deliberate venoms are really what we're discussing here - yes, they're present, and yes, they'll kill people, but the real question is how different will the various proteins and such the local biology uses be from Earths, and how much of a problem will they cause... I'm thinking of Encounter with Tiber here... which would be dealt with by the liver.
Anyway, I'd pin the likely population for the Imperials in the neighborhood of five billion, plus-minus about half a billion. That's:
Jungle - one billion
Desert - 100,000,000
Water - 400,000,000
Continent - three billion
Ice - five hundred million
and all but the fourth about half that fifty years ago.
Ja, -n
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"Puripuri puripuri... Bang!"
Anyway, I'd pin the likely population for the Imperials in the neighborhood of five billion, plus-minus about half a billion. That's:
Jungle - one billion
Desert - 100,000,000
Water - 400,000,000
Continent - three billion
Ice - five hundred million
and all but the fourth about half that fifty years ago.
Ja, -n
===============================================
"Puripuri puripuri... Bang!"