2. Their sensitive hearing allows them to keep in touch over long distances.
a) Elephants
b) Polar Bears
c) Humpback Whales

3. They also use their ears as signaling devices, often to warn others of approaching danger.
a) Elephants
b) Polar Bears
c) Humpback Whales

4. They can endure a 4,000 mile long migration, the longest of any animal.
a) Elephants
b) Polar Bears
c) Humpback Whales

5. Their lives begin inside a den where they grow rapidly and remain until spring.
a) Elephants
b) Polar Bears
c) Humpback Whales