Indri Lemurs Use a Soprano-Like Singing Trick
Monday, September 28, 2026179 words3 minutes1379 reads
Indris are famous for unusual songs in the rainforests of Madagascar. They are the only lemurs known for singing. Their family groups use songs to communicate in a place where thick plants can make it hard to see other groups.
A new study found that indris open their mouths wider for higher notes. Researchers looked at 83 videos of 19 wild indris. They compared the animals' mouth movements with the pitch of their songs. The link between wider mouths and higher pitch was strong.
This pattern is consistent with formant tuning. The mouth and throat act a little like a tube. When their shape changes, the sound can resonate differently. A better match between the voice and the vocal tract may make a high note more powerful and help it travel farther.
Trained opera singers use a similar technique. The finding does not mean an indri is an opera singer. It shows that animals and humans can use similar body changes when they face a similar sound problem: how to make a high note carry through a large space.
