From:
http://www.idea-queen.com/kids-games.html
(Yes, this is my site, so I do have republishing rights

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Outdoor Games For Kids - Fox & Hen
This game was something I played as a child which was taught to me by my mother. It's the most simple game there is for young children, and nothing is needed aside from two children. Feel free to use variations of the game to make it more interesting for older children or let their imagination run wild.
Setting Up:
First you will need a path. This game is typically played during the fall and winter months, where you can make paths in the leaves or snow. Paths should be clear accross the yard, full of dead ends and loops.
Next assign the players. One person will be the fox and the other the hen. If there's other children playing, they will be hens as well.
Rules:
Start off in different areas of the yard, and keep on the path. The object of the game is for the fox to catch the hen(s). This is similar to a game of tag, except all players must stay on the paths.
Variations:
Some variations might include making a 'start' and a 'finish' for the hens, and seeing if they can make it there before they are caught by the fox.
Another variation would be with multiple hens, with the last hen not caught being the winner. You could also time the hens to see how long they last before getting caught.
Have fun!