Purple rhino questions

[woolymonkey]

I really don't want to get caught in the controversy about whether  the purple rhino virtual gift is a Good Idea.  (I try to steer clear of the really world-shattering issues.)  But I'm puzzled.

What is this "forgotten" symbol of the Gay Rights Movement? 
Why have I never heard about it until now?  Ignorance?  Britishness?  (Rhinos failed to swim the Atlantic?)
Who thought it would make an inspiring symbol for gay people?
Why?
Why a rhino?
Is this all a wind up?
Why?
Why purple?

Is there any connection to the Purple Cow Poem?

And, finally... why?

Please help if you can!

Comments

[artaxastra.livejournal.com]

I have to say, 15 years of working in the LGBT movement, and never once did I see a purple rhinoceros! It may be regional or something?

penknife adds, "I never saw a purple cow, either."

[woolymonkey.livejournal.com]

penknife found some in Boston, and the_stowaway spotted one in San Francisco. So they might pass your way as they migrate.