This is "the duck" pond.  Quotations deliberately placed to emphasize the singularity of the duck.  This duck is something of a mean spirited waterfowl.  I saw it attacking and chasing out a snake today.  I'm not kidding.  I have a video if you don't believe me.  There are never any male callers in this pond, nothing else lives there.  Come to think of it, there is a striking absence of orangutans in this pond as well.  Clearly this duck has chased them out.