Submitted by Whats-Upvote t3_11cjb1s in Showerthoughts
DrInsomnia t1_ja4jodn wrote
Reply to comment by DrInsomnia in For birds all sex is anal sex. by Whats-Upvote
I should add that mammals are the outlier here, having subdivided these tasks into separate orifices. Most vertebrates have a single opening, derived from embryological anal opening, which does it all.
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