Another way to distinguish the T. tumpara from other tarsier species such as T. sangirensis and T. dianae is its distinctive duet note in the different sexes.

[3] The Siau Island tarsier is a very small species which measures around 4 to 6 inches (10–15 cm) in body length.

[3] Siau Island tarsiers are an arboreal species, which means they spend most of their time in trees, and therefore are very agile and excellent at jumping and climbing.

[3] The T. tumpara's main method of hunting consists of sitting quietly on a branch and waiting for a prey to arrive to attack it.

[3] Siau Island tarsiers can reach sexual maturity at two years old, this means that they carry and give birth to an offspring.

It was furthermore elaborated upon that the original description of T. sangirensis included mention of a specimen from Siau in the Dresden Museum.

[12] Its habit is at risk since it is not recorded as a protected area, and therefore is subjective to drastic habitat loss if no conservation practices are put in place.

[13] The progressive disappearance of its habitat, with the large population of the Siau people [311 people/km2], restrains the primate communities within a small area.

[7] Other threats such as the volcanic activities of the island, though most of these are interconnected and all play an important role in the endangerment of the tumpara tarsier.

[3] The species primary predators are humans, arboreal snakes, lizards, birds of prey and feral cats.