Usually nurse sharks only have one or two offspring at a time.

The endangered gray nurse shark is its own worst enemy.

The environment is too different and it's hard to predict when it will happen.

It has no disease control system. This virus can infect not only birds, but other animals too,

My biggest dream is to win four Majors in a year.

Many countries use vaccines and think the virus is completely exterminated ... but this problem is still in southeast Asia. It's even in migratory birds and they are dying. Why? Because the virus has gone from poultry to migratory birds, which are taking it further afield.