The sad thing is- 10 million sharks are killed every year due to shark finning, hunting and also the toxins in the water. And on average humans are killed every year by sharks! Sharks could go extinct in the next 100 years unless we do something.
Older siblings to younger siblings. Younger siblings to older siblings. All siblings to each other for sport, really. There's so many buttons to push and it's an art form to know the exact right moment to push one.