Polar Bear Cubs
Only about 50 percent of polar bear cubs live past their first year. Their survival rates vary greatly, which means only the toughest polar bear babies survive. They have to battle temperatures of minus 45 degrees Celcius. Once they’re born, they don’t leave the den for another three to four months, making it the most vulnerable time of their existence. Not only do these babies have to survive in extreme temperatures, but they’re also susceptible to starvation, falling prey to wolves, and drowning while swimming long distances (Polar Bears International).