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* Dormant testes light brown/yellow in colour, turn white when sexually active.
 
* Dormant testes light brown/yellow in colour, turn white when sexually active.
 
** In some psittacine species, immature or dormant testes may appear black due to melanocytes located in the interstitium.
 
** In some psittacine species, immature or dormant testes may appear black due to melanocytes located in the interstitium.
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'''''Semniferous Tubules'''''
 
'''''Semniferous Tubules'''''
 
* Produce sperm from the epithelium.
 
* Produce sperm from the epithelium.
* Interstitial Leydig cells lie between semniferous tubules.
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* Interstitial '''Leydig cells''' lie between semniferous tubules.
    
== Phallus ==
 
== Phallus ==
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