A Formica ant suspends a drop of aphid honeydew between her mandibles (which bristle with 7 or more teeth), as she drinks it. 
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Panther, a toilet-using cat, photographed in San Francisco on 22 August 2005. He is ten years old and has been using the toilet since the age of six months.  Photo courtesy of 'Reward.'Readers contributed to December's walking geese question.  Here's your next question: 

Can a domestic cat be trained as well as a dog? Because, I've tried to train mine with not much success...  Vicky, Maracaibo, Venezuela

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Primate fingerprints

Do other primates, such as apes, chimps, and monkeys, also have fingerprints? If so, are they also unique to that individual?  Jeff, Corrales, NM

The chimpanzee, Bonobo.  Photo courtesy of Kabir Bakie and Wikipedia.Yes to your first question and yes to the second, and, even more surprising--some monkeys have fingerprints on their tails.

The chimpanzee, Bonobo. Photo courtesy of Kabir Bakie and Wikipedia.

"All primates have fingerprints on hands and feet, and a few New World monkeys have them on their prehensile tails as well," says Jeff Froehlich, Professor of Anthropology at the University of New Mexico.

No other mammal has fingerprints, only we primates do. The non-human primate fetus develops fingerprints as a human does, during the first trimester of gestation. According to Jeff, there is just enough "noise" in the genetic system (fetal position, cleavage of the egg in twins, etc.) so all individuals are unique, although identical twins are about 95 percent alike.

Jeff uses the fingerprints of primates he studies to classify them and examine their evolutionary relationships. Based largely on their fingerprints, he has just categorized and named a new monkey species in Indonesia.

Ken Gander, Director of the Duke University Primate Center, has been studying the same population of mantled howling monkeys in Costa Rica since 1970. He has collected about 500 nonhuman fingerprints during the past 30 years, using the same material and technique the police use to take fingerprints.

"In fact," he says, "I order my fingerprinting supplies from the police supply house."

Further Reading

Duke University Primate Center

 

 

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