A 15-year study in Borneo found that orangutan mothers will set off a day early and cross territories so their young can spend twenty minutes with a playmate their own age — and no one yet knows what it is for.
Male orangutans are useless at parenting: they hand over their genes and disappear back into the forest. Everything else falls to mom.
She has to teach her child how to fish for termites and pick fruit. There are more than 250 items on the menu to learn, and the lessons take six to eight years.
An only child with no siblings to roughhouse with
Orangutans are mostly solitary, and a female typically gives birth only once every seven to nine years, so every youngster is an only child with no one at home to fool around with.
A team from the Max Planck Institute followed 31 mother-child pairs in Borneo for 15 years, racking up more than 32,000 hours of observation.
What they found: mothers whose offspring were close in age tended to share the same patch of forest, and those youngsters played together more often.
A day of travel for twenty minutes of play
Then there is the cost. On playdate days the mothers travelled farther, sometimes setting out a day in advance and heading back to their own territory once playtime was over.
How do they find each other? The researchers call it forest gossip: they know who their lifelong neighbours are, and who had a baby when.
These meetups are rare — they happened on only six percent of observed days, and sessions lasted around 20 minutes.
Nobody knows what it buys them
Paying that much to arrange them suggests they are worth something, but what, exactly, the team cannot say.
Does it give the young an advantage later in life? No answer yet. Only long-term studies like this one, the authors say, are likely to unlock it.
Or maybe mom just needed a break.
Why it matters
That solitary animals have no use for company is a lazy assumption. These mothers keep track of neighbours they might see a few times a year, and that memory becomes a way to get something for their children — the value of a network lies less in how often you use it than in whether the right person is findable when it matters.
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