Monkey Forest Tales: Notes from the field

I’m writing today’s post from the field. After almost 8 months without being in the field is just an incredible feeling to be here and being able to breath this air. Although I don’t live so far and still get some glimpses of rural life despite being in a city. The joy I felt the moment I get back to the farm where this project started is something I can hardly describe.
And it is even more incredible the feeling of looking at monkey’s groups that I learn to know for the last 16 years. Going back to the field after all these months of inactivity was challenging physical and in some ways emotionally.
We get some good and not so good news this time. Let’s start with the goods…. New babies were observed in red howler monkey’s groups, in two groups, and three groups of black-capped capuchins, all born during the pandemics. A big group of coatis was also observed with babies also born during the pandemics. Chela, my favorite Colombian squirrel monkey female is still around with a juvenile going behind her, probably a baby from a few years back. Babies born in February from Colombian squirrel monkeys and dusky titi monkeys are growing well and healthy. And lastly but not least people are doing good and healthy in the farms despite the pandemics.
Now let’s talk about the not so good news…one of the red howler groups had a high infestation of botflies, especially the older juveniles, but also the adults. Although it is possible to see this kind of parasites in red howlers, in all the years I had been looking at red howler monkeys in fragmented and continuous forest, I had not seen so many group members with botflies.
The highest infestations of botflies that I had seen were in forest fragments in near proximity to cattle ranching and palm oil plantations. Although both situations are present in the forest fragment in which the group is found, the cows doesn’t have botflies at the moment and the palm oil plantation is not that close to the fragment. It is separated by two big pasture plots. Another possible explanation can be related to a decrease in their immune system response due to poor habitat quality.
Despite being October the second month with highest fruit productivity in that forest fragment, this year the forest fruit production seems to be delayed, fruits are just starting to be available. Another possible factor that can be playing a role is the fact that, it is a big group (ten individuals), which can increase competence and affect more older juveniles than the youngers and other members of the group in terms of access to food resources. However a more detailed observations are needed to understand this particular pattern. Hopefully the group will survive without any loss…at least I had never seen a red howler monkey die from botflies and let’s hope this won’t be the case…
For now we are able to start again our monitoring of monkeys in the study area and we keep a close eye on the red howler monkey’s group with botfly infestation. Hopefully next month we will be able to go again to make surveys and some of our students will be back in the field looking at these incredible resilient animals that always put a smile in my face…
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