WHAT'S INSIDE: FISH
- Freshwater Fish
- Saltwater Fish
- Other Fish
The lungfish is a fish that breathes with a lung as well as by gills. The African and South American lungfishes use their lungs to breathe air while they estivate (are dormant) in mud in times of drought.
Humans kill an estimated 100 million sharks every year. Some of these sharks are harvested for their supposedly cancer-fighting cartilage. Is there any truth to the claim?