Date: 2 Nov 2007 17:34 (UTC)
From: [identity profile] annvole.livejournal.com
I read that most (or all) marsupials have paired heads to their penises to service the paired female uterus but the alternating pairs or four headed penis of the echidna lacks a obvious reason

the swim team efforts of the sperm is what fascinates me... how in the world would sperm get organized to do synchronous swimming?

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