Actually, they are listed. These are Coquerel's Sifaka (Propithecus coquereli).
The zoos that currently have them according to ISIS are:
Maryland Zoo (3.0)
Duke Lemur Center (14.9)
Houston Zoo (2.1)
Los Angeles Zoo (2.1)
Bronx Zoo (2.1)
Philadelphia Zoo (3.1)
Sacramento Zoo (1.1)
St. Louis Zoo (4.3)
Actually, they are listed. These are Coquerel's Sifaka (Propithecus coquereli).
The zoos that currently have them according to ISIS are:
Maryland Zoo (3.0)
Duke Lemur Center (14.9)
Houston Zoo (2.1)
Los Angeles Zoo (2.1)
Bronx Zoo (2.1)
Philadelphia Zoo (3.1)
Sacramento Zoo (1.1)
St. Louis Zoo (4.3)