Horse Refuses To Give Birth - When The Vet Sees The Ultrasound He Calls The Police

When farmer Ben saw that his horse was pregnant, he was full of joy. It meant that he was about to have another horse, which could lead to more financial wealth if it was a 'good' horse. After waiting for months, the moment was nearly there. The horse was about to give birth. But strangely enough, it refused to give birth even with a giant stomach. Ben decided to go to the local vet to get an ultrasound. When the vet saw the ultrasound he immediately called the police.

But what was wrong with the horse? And what did Ben do wrong?