The positional behavior of pygmy marmosets (Cebuella pygmaea) in northwestern Bolivia
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Pygmy marmosets are distinctive given their diminutive body size, their year-round reliance upon exudates, and their use of morphologically adapted tegulae to engage in a high degree of claw-clinging behaviors associated with exudate exploitation. This project examined the positional behavior and habitat preferences of one group of pygmy marmosets in a secondary forest within the Department of Pando, northwestern Bolivia. Results from this study indicate that pygmy marmosets primarily use claw-clinging during feeding (89.6%) with preferential use of large vertical trunks. Claw-clinging was also the dominant postural mode during exudate foraging (43.1%) with preferential use of large vertical trunks. Quadrupedalism was the dominant locomotor mode during travel (55.7%) with preferential use of bamboo and medium-sized substrates. These results support previous notions that claw-climbing is a solution to overcome the constraints of small body size while suggesting that quadrupedalism is a habitat-dependent locomotor mode.
KeywordsPygmy marmosets Positional behavior Habitat use Habitat preference
This project was financially supported by Dr. Leila Porter’s National Geographic Research and Exploration Grant. I would like to express the deepest gratitude to Dr. Leila Porter, as this project would not have been possible without her devoted maintenance of the Camp Callimico field site. I would also like to thank all the reviewers for their work on all previous and current versions of the paper.
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