The Makapansgat pebble is such a manuport, found in a cave in South Africa’s Makapansgat Valley, associated with Australopithecus' remains. It is a natural object with distinct color and shape and with marks that resemble a face. Although the marks themselves were produced by natural processes and not by the actions of our distant relative or ancestor, that is, the object was not made but only found, Bednarik associates it with paleoart.
We can say therefore that art started with the “ready-made”.
Robert G. Bednarik - Manuports and very early palaeoart
CogWeb: Cognitive Cultural Studies (UCLA) - Hominid Family History
Human Evolution - Hominid fossil record and hypothesized lines of human evolution
Australopithecus afarensis compared to Homo erectus.
Credit: Laszlo Meszoly, Harvard U.
"On the basis of a skull found at Hadar in Ethiopia in 1992,
the artist John Gurche has produced a stunning
reconstruction of Australopithecus Afarensis.
This species flourished in the period 3.7 million
to 3 million years ago."
LINES OF HUMAN EVOLUTION
Hominidae : Humans, great apes, and their extinct relatives
"Phylogeny in part from Purvis (1995)."