Snakes alive!

Hanna the hen loved hatching eggs. They were smooth and round to sit on, and after a few weeks lovely little chicks popped out. One day, when she had no eggs of her own to sit on, she was at the edge of the farmyard when she saw some eggs in a hole in the ground. "Wonderful," she thought. "These eggs look a little different from mine, but I'll hatch them all the same." She had only been sitting on them two or three days when her friend Hortense came by and gave a little scream. "What are you doing Hanna?" she said. "Those are viper's eggs. If you hatch them all you'll get is a bite in the bottom!"