The lemurs sometimes gather at the places where the territories overlap; there is no aggression on these occasions, but much vocalisation for a period of ten or twenty minutes.

The animal moves on all fours, running rapidly along branches, climbing and jumping, mostly at a few metres above the ground, but descending to the forest floor on occasion.

This lemur has also been observed licking the flowers of Crateva greveana, and feeding on a "syrup" produced by insect larvae on thin branches of Rhopalocarpus lucidus trees.

[4] Gum is low in nitrogen content, and the Masoala fork-marked lemur needs to supplement its diet with animal prey, which it stalks on the tree bark and among the foliage, catching it with its hands and stuffing it into its mouth.

In captivity this lemur was found to be very selective about what it ate, rejecting grasshoppers, beetle larvae and small lizards, but feeding avidly on a large moth and a praying mantis.

This remains in the nesting hole of the parents at first, but as it gets older it is carried by the mother, clinging to her underside, and when it gets larger, to her back.

[7] The P. furcifer population is suspected of being in decline as its forest habitat is being destroyed by timber harvesting and slash-and-burn agriculture.