Who Notices the Falling Figs?

A Watch Beneath the Fig Trees

At a rainforest research station, a field team watched ripe figs fall from trees. Coatis, mammals with long noses, sometimes searched the ground for fruit. Toucans sometimes perched on low branches nearby. The researchers wanted to compare how often these animals turned toward a fig when it landed. They watched from a shelter and did not feed, touch, or call to the animals.

The team compared two kinds of events. In an open-view event, no leaves blocked the animal's view of the landing spot. In a blocked-view event, thick leaves hid that spot. Falling figs sometimes made a thump. Leaves could block the view without stopping all sound from reaching the animal. The researchers did not know exactly what each animal heard.

Over several weeks, the team recorded ten events of each kind for coatis and ten of each kind for toucans. They counted an event as a response if the animal turned its head toward the landing spot within five seconds. They used the same response rule and observation time throughout. The graph shows the team's counts. These were natural events, not a controlled test: distances, individual animals, and background sounds could differ.

The team also wrote longer notes about a few events. After one fig landed in view, a toucan turned toward it, flew down, and picked it up. At another time, a coati sniffed near fallen leaves, pushed them aside with its nose, and uncovered a fig. These notes recorded actions, not a view inside either animal's brain.

Animals receive information through sense organs, such as eyes, ears, and noses. Messages from these organs reach the brain. The brain processes incoming information and can use memories of earlier experiences to guide body actions. An animal may receive information from several senses at once. A movement alone does not reveal every message the brain received or which memory it used.