Locomotion, Postures, and Substrate Use in Captive Southern Pygmy Slow Lorises (Strepsirrhini, Primates):
Dionisios Youlatos1,2, Dimitris Pylarinos1,3, Nikolaos Evangelos Karantanis1
1Department of Zoology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Animals : an Open Access Journal From MDPI
|June 13, 2025
Summary
The endangered southern pygmy slow loris exhibits specialized arboreal behaviors, utilizing diverse substrates and locomotor modes. Understanding their positional behavior is key for effective conservation strategies and habitat management.
Area of Science:
- Primatology
- Behavioral Ecology
- Conservation Biology
Background:
- Positional behavior (locomotor and postural) is vital for understanding animal-environment interactions and conservation.
- The positional behavior of lorises, particularly the endangered southern pygmy slow loris (Xanthonycticebus pygmaeus), remains understudied despite their specialized morphology and ecology.
Purpose of the Study:
- To investigate, for the first time, the positional behavior and substrate use of the southern pygmy slow loris.
- To provide baseline data crucial for the conservation and management of this endangered species.
Main Methods:
- Behavioral data collected using 30-second scan instant sampling.
- Observations conducted on seven captive southern pygmy slow lorises at Poznań Nowe Zoo.
- Data collected over a five-month period (February-June 2013) in an enriched enclosure.
Main Results:
- Southern pygmy slow lorises are almost exclusively arboreal, with most activities on multiple substrates (82.93%).
- Small (57.91%) and large (28.28%) substrates were extensively used, with horizontal (42.11%) and oblique (38.47%) orientations dominating.
- Clambering (39.39%), quadrupedalism (33.77%), and vertical climbing (17.62%) were primary locomotor modes, with standing (47.23%) as the dominant posture.
Conclusions:
- Pygmy slow lorises possess a diverse and flexible positional repertoire, adapted for exploiting complex forest structures.
- Habitat protection and management, coupled with ex-situ reintroduction programs, are essential for conserving southern pygmy slow loris populations.
