The Swimming Chicken
It is a fact that chicken can swim just as ducks. The only problem is that the chicken do not know that! That is why it is dangerous to let them into the water. They start to panic and flap their wings. These soak the water, get very heavy and the chicken starts to sink.
This happens because the feathering of chicken is a bit different compared to the one ducks have. The feathering of a duck protects it against the cold temperature of the water and at the same time it does not let ingress the water.