Grey Slender Loris night walks in Popham's Arboretum: red filter torch wavelengths?
3 Answers from travellers
Popham’s Arboretum in Dambulla is Sri Lanka’s premier sanctuary for the Grey Slender Loris. Lorises possess huge, specialized eyes with a highly reflective tapetum lucidum designed for gathering faint night light. Shining white LED or halogen lights causes immediate retinal shock, pupil constriction, and temporary blindness, leaving them unable to hunt insects or navigate thorny acacia branches. Guides use torches equipped with specialized deep-red filters (650nm+ wavelength), which illuminate tapetal eye-shine without startling the primates.
Walk with soft steps along gravel trails; lorises freeze motionless high in the canopy when they detect cracking twigs or rustling dry leaf litter below.
Night walks must be booked in advance with the arboretum management; independent off-trail excursions into dry scrub are barred due to foraging wild elephants.
You must be logged in to post an answer.
Log In to AnswerRelated questions
- Wildlife parks in Sri Lanka beyond Yala - Wilpattu, Minneriya, Udawalawe - which is worth visiting?2 answers
- Kandy Esala Perahera - when does it happen, where are the best viewing spots, and how do I get seats?2 answers
- Arugam Bay vs Weligama for intermediate surfing - which should I choose and why?2 answers
- Best local food to eat in Colombo - where do locals actually eat and what should I try?2 answers
- How cheap can you realistically travel Sri Lanka on a shoestring - $25-30 USD per day?2 answers
- Ayurveda retreat in Sri Lanka - what to expect and how to find genuine treatment vs tourist trap?2 answers
Join a Crew
Kandy Perahera Live Tonight
Perahera Seats, Hotels & Roads
Dalada & Perahera Culture