John Patrick Hughes:
<< The Gloranthan temperature gradient is
always North/South: southern Pamaltela is a realm of fire, northern
Genertela is a realm of ice. Therefore, long distance migrations would
not occur for the same reasons as on our particular mote in the cosmos.
>>
I am not convinced by this reasoning; if a creature likes to live in a
10degrees C average temperature (for example) then migration is a lifestyle
option.
A creature that cannot endure a freezing temperatures can go Valindwards in
FireSeason, and must retreat Pamaltwards in Darkseason.
Hollri are an example of a creature that could be highly migratory.
Temperature aside, there are plenty of other weather patterns worth worrying
about - winds could carry creatures to new areas, leaving them there for a
season until they pick up another wind (see the seasonalble sailing in Missing
Lands for complicated weather patterns)
Add to this the excellent Gloranthan examples you provided, like the silkmane,
and Giant Insects, and there seems to be even more reason to migrate than on
earth.
Keith Nellist