Pygmy marmoset sap tree, Putumayo, Colombia

In the afternoon of this day, we made way to some farmland on the outskirts of Mocoa where we would have good odds to see a Pygmy Marmoset. These are the smallest monkeys in the world, yet not the smallest primates, weighing a mere 100 grams as an adult. They typically have tiny feeding territories where they hang around 1 or 2 trees from which they drink the gum (sap). I've included a photo of such a tree in this set. They stick around that tree until it is depleted, and then move their territory. Since we knew the location of the tree, all we had to was wait for it to come and feed on it. I didn't actually feed on it, yet after 30 mins of waiting one did make a careful approach.

I'm unsure whether this is the male or female, as they look the same, the female is just a little bit heavier.