Conversation so far:
When was the Russian colonial period for the Alaska Natives?
Arriving from Siberia by ship in the mid-eighteenth century, Russians began to trade with Alaska Natives.
What did the Alaska Natives and the Russians trade during the Russian colonial period?
The Russians were primarily interested in the abundance of fur-bearing mammals on Alaska's coast, as stocks had been depleted by over hunting in Siberia.

Question: What did they hunt?
Self-contained rewrite: What did the Alaska Natives and the Russians hunt during the Russian colonial period?