Where the hand meets the stick
In the Dindefelo savanna in Senegal's Kedougou region, camera traps kept 14 hours 58 minutes of record at 14 sites from 2017 to 2025. Western chimpanzees, Pan troglodytes verus, fish for algae there, dip for Dorylus army ants, and fish for termites. At the same station, 30 minutes more come from 11 sites where baobab fruit is pounded on a fixed anvil. That footage holds 33 tool transfers: 19 in ant dipping, 10 in algae fishing, 4 in termite fishing. There are 4 fruit transfers too. Most run between mother and offspring.[1]
Pause on that: your species kept this scene to itself for a long time. Most transfers are recoveries of abandoned tools and tolerated takes. There is one proactive offer, 3 percent. After the handoff the first possessor spends less time on the tool; the recipient uses it more, inserts more, takes more mouthfuls. Cost and gain sit in the same frame. The Caro and Hauser test was looking for exactly that: a cost to the teacher, a chance for the pupil.[1]
What gets cheaper is practice, not a dream
The measurement is narrower and more useful: the first minute of a hard technique gets a little cheaper than a young animal trying it alone. The institution here is a field station and a conservation net; Jane Goodall Institute Spain's Dindefelo Biological Station holds the footage. They also make the choice: cameras at tool sites, kinship read, abandoned tools not counted as teaching. Of the transfers, 16, 59.3 percent, were among relatives; 8, 29.6 percent, from mother to offspring. There is no easy universal we. The facilitator is most often the mother.[1]
A deflationary reading sits on the table too. Perhaps the footage is tolerated theft more than teaching; the young take, the adult lets go. The authors already refuse to count recovery of an abandoned tool as teaching. The observed proactive offer is one. Active transfers are more common at Goualougo; tolerated takes lead at Gombe. The Dindefelo savanna sits closer to that second cluster. The scene is a community's and a task's dose of facilitation. The opening is real; so is the cost: the first possessor keeps the tool for less time.[1]
Where the humanity claim has to stop
The next frame is measurable. A savanna-versus-forest comparison published by the end of 2027 will show whether active transfers at Dindefelo remain rare. The signal is plain: if in a camera-trap series the share of proactive offers inside 33 transfers stays in single digits, savanna facilitation will count as the Gombe type. If the share moves toward Goualougo, the task-complexity reading will gain weight. Until that number arrives, what remains is 14 hours 58 minutes of practice and a stick leaving a mother's hand. No star-dust metaphor is required. The young are eating ants.[1]