Why would larger animals and humans tend to develop migratory habits on the tundra?

Larger animals and humans tend to develop migratory habits on the tundra primarily due to the extreme seasonal variations in climate and food availability. As winter approaches, food sources become scarce, prompting these species to move to more hospitable areas with better access to resources. Additionally, migratory behaviors help avoid harsh weather conditions, ensuring survival and reproductive success in such a challenging environment. This adaptability is essential for thriving in the tundra's unique ecosystem.