Prohibitions against eating certain animals? I sometimes see rules suggesting that monks (at least Theravadan) should not eat various animals. The lists vary, but includes to varying degree: elephants, horses, dogs, snakes, lions, tigers, leopards, bears, hyenas, slugs, cows, and humans.

When I try to find something authoritative about this, I've come up short. Can anyone shed light on: (1) is there a list of animals that monks are prohibited from eating, and if so, (2) where does this appear in the canon, and (3) how/why were the particular animals listed?
Page 308 of The Patimokkha Rules
Translated &amp; Explained
by Thanissaro Bhikkhu:


  The Mahavagga (Mv.VI.23.9-15) forbids ten kinds of flesh: that of human
  beings, elephants, horses, dogs, snakes, lions, tigers, leopards, bears, and hyenas.
  
  To eat human flesh entails a thullaccaya; to eat any of the other unallowable
  types, a dukkata. Human beings, horses, and elephants were regarded as too
  noble to be used as food. The other types of meat were forbidden either on
  grounds that they were repulsive (“People criticized and complained and spread
  it about, ‘How can these Sakyan-son monks eat dog meat? Dogs are loathsome,
  disgusting’”) or dangerous (bhikkhus, smelling of lion’s flesh, went into the
  jungle; the lions there, instead of criticizing or complaining, attacked them).
  
  The Commentary adds three comments here: (a) These prohibitions cover
  not only the meat of these animals but also their blood, bones, skin, and hide
  (the layer of tissue just under the skin—see AN 4.113). (b) The prohibition
  against dog flesh does not include wild dogs, such as wolves and foxes, (but
  many teachers—including the Thai translator of the Commentary—question this
  point). The flesh of a half-dog half-wolf mixture, however, would be forbidden.
  (c) The prohibition against snake flesh covers the flesh of all long, footless beings.
  Thus eels would not be allowed.