Nocturnal
- Aye Aye
- Fat-Tailed Dwarf Lemur
- Pygmy Slow Loris
- Slender Loris
- Slow Loris
- Northern Giant Mouse Lemur
- Gray Mouse Lemur
When lemurs began to spread out over the island of Madagascar more than 60 million years ago, they began to fill every biological niche. This even included such factors as whether the lemur was active during the day and slept at night (diurnal,) or whether they were active at night and slept during the day (nocturnal.)
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