The place where Abraham said William could be searched is:
Sancho and Bolsa.
In scene 19, after arriving at the zoo and talking to the information lady who told them where William's parrot called Abraham was, they go there and find him, after which they try to obtain information from him.
The detectives knew that parrots often repeat the words they hear, so they hoped Abraham would tell them some of the words heard from William Morningstar that would serve as a clue to find him, after which the parrot mentioned "shed."
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