Possible Clues:

• Monkey-like animals of Madagascar
• Madagascar tree climbers
• Arboreal African animals
• Breaking rules to admit the first of Madagascar's nocturnal mammals
• Primates slumber uneasily but not bishop
• Extremely cute tree-hoppers
• Tree-dwelling primate with large eyes and long busy tails
• Primates with tails
• Animals found only in Madagascar
• Rules out involving large number of primates