No Turtle Signage

After browsing through the animal shaped signs, the one animal I need doesn't even appear to exist as a sign, which is either a Turtle or Tortoise. Any chance for this to be placed in the game as it'll go with my Hawaiian themed Zoo?
 
It's not the only one, warthogs and flamingos seemed to have missed the sign makers creativity, unless they are under themes I haven't unlocked yet.
 
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