Brothers make marmots 'tom boys'
Female marmots born in litters that are mostly male become "tom boys", behaving in ways that are more typically male, say scientists.
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| Published | 08:29:04 on Wednesday 31st August 2011 |
| International Date: | 2011-08-31 |
| UK Full Date: | 31/08/2011 |
| UK Short Date: | 31/08/11 |