Typically observed on or near the forest floor, the Thyolo alethe is most often seen alone, although small flocks of up to five individuals have also been found (4). It hops around in the leaf-litter (3), foraging amongst dead leaves to feed on insects, including army ants, beetles and larvae (2). It may also pluck insects from tree trunks and leaves whilst in flight, and will follow a swarm of army ants to take advantage of the insects that are disturbed by this march. Up to four or five Thyolo alethes may feed on the abundance of prey that is revealed by a single swarm of ants (2).
Only a single nest of this species has been found: green moss shaped into a cup and lined with dry tendrils. This nest was situated in the fork of a tree, four metres off the ground, and held three eggs within it (2). It is thought that the Thyolo alethe lays its eggs between September and January (3).