1. They are diurnal animals , and navigate in very small herds. 2. In diurnal animals , sleepiness increases during the night. 3. In the case where two species occupy an identical shelter for diurnal animals . 4. It is a diurnal animal , and most active in the morning and evening. 5. The common dwarf mongoose is a diurnal animal . 6. Allen's swamp monkey is a diurnal animal and regularly looks for food on the ground. 7. The malbrouck is a diurnal animal living in large groups, consisting of six to more than 50 animals. 8. Also, certain plants or diurnal animals need a source of UV to help synthesize Vitamin D and assimilate calcium. 9. One of the main advantages of being a nocturnal animal is that there is greatly reduced competition from diurnal animals . 10. Chuckwallas are diurnal animals , and as they are ectothermic, spend much of their mornings and winter days basking in the sun.