When Ross tries to find Marcel, Mr. Lipson claims that he passed away, stating that he "got sick, then he got sicker. Then he got a little better... but then he died." Lipson is later revealed to be lying, however.
Later a janitor tells Ross that he knows the true whereabouts of Marcel. He informs him that there was a break-in and he was taken (along with a snowy egret, a two-toed sloth, and three hooded sweatshirts from the zoo gift shop) and that the story told to Ross is a big cover up because the zoo wants to avoid bad publicity.
Dean Lipson leaves Ross with the saying "sometimes monkeys die" which he states is "not a great saying" but "certainly fitting today" and zoo dollars.
Lipson appears to be a very nervous person, who has a tendency to impulsively say ridiculous things while trying to remain calm and tell lies.