1. Keep trying to breed them, even though they say they are too hungry, I have had them "go indoors" after a couple more tires. Also the women do not like to breed with more then one man.
2. Look in the action field to see what it says when he runs away. Like "they're too hungrs", or "he's not old enough". This will give you a good clue.
3. It is successful when they head to the hut and it says "going indoors".
Hope this helps.
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The VI