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== Age when Behavioural Traits are Expressed ==
 
== Age when Behavioural Traits are Expressed ==
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* Generally acquire reproductive behavioural traits such as mounting and erection a long time before they acquire the ability to ejaculate and produce spermatozoa.
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* Behavioural traits are easy to determine, as mouting behaviour and erection can be easily observed.
    
== Age at First Ejaculation ==
 
== Age at First Ejaculation ==
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