Using Prepare Carefully, I embarked with a pair of arctic wolves, in a temperate biome. The female just gave birth to two timber wolf puppies.
EDIT: it gets weirder. The timber wolf puppies grew up to be arctic wolves.
While I thank you for the report, in the future, please post bugs you encounter while playing with mods in the "Mod Bugs" forum section.
I thank you for the report, though a couple threads already exist on this, though it has not been put on Mantis yet.
https://ludeon.com/forums/index.php?topic=26439.msg267396#msg267396
https://ludeon.com/forums/index.php?topic=25532.0
Thank you for the report. Although as nccvoyager says, this is a known issue that has already been reported (although not Mantis'd AFAICT. Or at least a search for it comes up blank).
I will close this thread now as a duplicate. Edit - If this issue still exists in A16, then can you please post it in the active thread for this. Which is this one. Thanks.
https://ludeon.com/forums/index.php?topic=26439.0
Edit 2 - This should be fixed for A16.