The study reinterprets evidence about primate language and concludes that Old World monkeys
can combine two items in a language sequence.
Fewer fossils of Old World monkeys
have been found, but a handful of monkey species are known to have inhabited Africa around 20 million years ago.
"We know that old world monkeys
also originated and migrated out of Africa millions of years ago, but until now, it has been unclear as to exactly when and how," said Dr Chris Gilbert, lead author of the study.
The pattern they saw suggests that the A and B blood groups were around at least 20 million years ago, probably as far back as the common ancestor of humans and Old World monkeys
cynomolgi), a close relative that infects Asian Old World monkeys
In a recent study of 91 Old World monkeys
tested, none exhibited PARV4-like virus seroreactivity, whereas 63% of chimpanzees (P.t.
Nicky and her team were involved largely with rescuing six species of monkeys, including Mona monkeys, Mangabey and Guenos monkeys - a breed of old world monkeys
native to Africa.
The team's findings document the oldest fossils of two major groups of primates: the group that today includes apes and humans (hominoids), and the group that includes Old World monkeys
such as baboons and macaques (cercopithecoids).
A mysterious kind of nerve cell that has been linked to empathy, self-awareness and even consciousness resides in Old World monkeys
However, EVs isolated from Old World monkeys
(OWMs) (principally Asian macaques) are grouped into species A and B; a separate simian species (SEV-A); or are unassigned (EV-108, SV6, and EV-103) (3).
Old World monkeys
were the most widely used primate, being chosen for 65% of all experiments.
"Human laughter derives from the play invitation vocalizations of Old World monkeys
and apes, but this is normally confined to juveniles and adolescents; adults don't play," he continued.