Their fur was thicker , glossier , and blacker than those of sea otters on the Pacific Northwest Coast and California .
The Russians had gained control of the habitats of the most valuable sea otters , the Kurilian - Kamchatkan and Aleutian sea otters .
Russians ' fur was thicker , glossier , and blacker than those of sea otters on the Pacific Northwest Coast and California .
The Russians had gained control of the habitats of the most valuable sea otters , the Kurilian - Kamchatkan and Aleutian sea otters .