Zoo Nocturnal Animal Welfare and Light Management

Nocturnal animals in zoo collections face specific welfare challenges related to lighting regimes, display requirements and the disruption of natural activity cycles.

Key Facts

Nocturnal exhibits typically use red lighting during visitor hours which animals can see less clearly than humans
Reversed light cycle management can allow nocturnal animals to be active during visitor hours
Nocturnal species include many bats, bush babies, slow lorises, aye-ayes and some small carnivores
Slow lorises are protected species but some zoos still hold them, with complex welfare implications
Incorrect light management can cause circadian disruption with health consequences in nocturnal species
Many zoos have invested in specialist nocturnal houses to meet the needs of night-active species

Welfare Considerations

Nocturnal animals in zoo collections face the fundamental challenge of living in an environment designed around diurnal human visitors. Forcing nocturnal animals to be active during daytime through bright exhibits is a welfare failure. Well-designed nocturnal houses with reversed day-night cycles allow animals to express natural activity patterns while giving visitors an authentic experience of their nocturnal behaviour. Red lighting during visitor hours respects the fact that most nocturnal species have limited red wavelength sensitivity. Circadian disruption from inappropriate lighting regimes causes health problems including immune dysfunction and reproductive failure. Nocturnal exhibit design is an area where zoo welfare expertise has made meaningful advances in recent decades.

What You Can Do

Support zoos with specialist nocturnal houses that use reversed light cycle management
Advocate for nocturnal animal welfare to be included in zoo accreditation assessments
Choose to visit zoos with high welfare standards over facilities with inadequate nocturnal exhibits
Avoid facilities that keep nocturnal animals in bright-lit general exhibits
Engage with zoo welfare organisations to raise nocturnal animal management standards