To date, partial skeletons of nine individuals have been
unearthed including one complete skull.
The most complete skeleton is known as LB1, and by the pelvis is judged
to be a female who was around the age of thirty when she died. Because of the very damp conditions in the
Liang Bua caves and the relatively recent age of the remains, the skeleton had
not been fossilised and the bones were in a very fragile condition when they
were found. The ‘hobbit’ remains are remarkable for several reasons. The single
most surprising thing is their small stature; they stood only about 1 metre
tall and were fully bipedal. They also had a very small brain size, around
417cc. This brain size is smaller than
the brain size range of chimpanzees, which is between 300 to 500cc, and also
those of the Australopithecines, who were a species of very early human. These ‘hobbits’
had human like teeth, but had a receding forehead and no chin. The bone
structure of the wrists, shoulders and arms are also proved to be more similar
to those of chimpanzees and Australopithecines than modern humans or H. erectus
in a 2007 study.
So how old were these remarkable skeletal remains of a new
species of dwarf human? The fossil skeletons range from being between 38,000
and 18,000 years old, but other archaeological evidence such as stone tools
suggests that H. floresiensis inhabited the island of Flores from as long ago
as 95,000 years ago and up to as recently as 13,000 years ago. This makes the
‘Hobbits’ the last-known surviving non-modern humans in the world, as the
Neanderthals had last walked the earth about 35,000 years ago. As modern humans
arrived on Flores between 55,000 and 35,000 years ago, these two very different
species of human would have presumably shared territory and interacted with
each other for thousands of years, although there is no archaeological proof of
this.
There are theories that the ‘hobbits’ survived until much
more recently and could even still be alive today, deep in the unexplored
tropical rainforests of Indonesia.
Folklore on Flores speaks of a strange creature called Ebu Gogo who were
small, human-like cave-dwellers who did not communicate and walked with a
strange gait. Reputedly they were covered in hair and had broad faces and large
mouths. The Ebu Gogo were known for stealing human crops and kidnapping
children, so the legend goes that sometime in the 18th century the
Flores Islanders tricked the Ebu Gogo into accepting gifts of rattan mats. As they returned to their caves with these
mats, the Flores Islanders followed them and set fire to the mats killing
nearly all of the Ebu Gogo, except perhaps for one couple who escaped to
continue on the Ebu Gogo line. Also, on
the Indonesian island of Sumatra, deep in the jungle, sightings are still
reported of a 1.5 metre high hominid the locals call Orang Pendek, which is
Indonesian for short person. But why
would H. floresiensis suddenly die out 12,000 years ago after surviving
successfully for so many thousands of years?
It is thought that a volcanic eruption in the region 12,000 years ago
could have been responsible for the demise of the ‘Hobbits’, the same eruption
that led to the extinction of the pygmy elephant Stegodon on Flores.
H. floresiensis was an unexpected discovery and it was a big
surprise that a non-modern human species existed on the earth until so recently
and was so small in stature, but what other controversy did the discovery of
the ‘Hobbits’ cause. Well, the big
debate is where they came from and how they evolved. Some experts believe that they
were a direct descendant of H. erectus, and that for some reason there had been
active selection for smaller brain size and stature. So did the ‘Hobbits’
shrink over thousands of years because of the evolutionary pressures caused by being
on an island with limited resources? Don’t forget that Flores had also been
home to a species of dwarf elephants that had adapted to their environment and
shrunk, and these dwarf elephants had been an important food source for the ‘hobbits’.
However, the study of the H. floresiensis
wrist bones showed them to be nothing like H. erectus carpal bones, as the ‘hobbit’
wrist bones lack features that had been present in early species of modern
humans from at least 800,000 years ago. If H. Floresiensis were a dwarf
variation of these earlier humans, it challenges the traditional view that H.
erectus could not cross sea barriers.
The island of Flores has always been separated from its neighbour Java
by a deep sea barrier, so if H. erectus was living on Flores, and in 1998 Mike
Morwood announced the discovery of stone tools believed to have been made by these
early humans dating back 840,000 years, then this theory is totally overturned
and they were indeed capable of travelling by sea.
However, an even more daring theory is that the ‘hobbits’
evolved directly from Australopithecines, who were some of our very earliest
human ancestors. Australopithecus first
emerged around seven million years ago in the Rift Valley of East Africa, and
australopithecine fossils show great similarities to the remains of the
‘Hobbits’, including small brain size, small stature and primitive wrist bones,
teeth and feet. This would mean that H. floresiensis did not shrink due to
environmental pressures, but started off small and stayed small. But the most startling aspect of this theory
is that Australopithecus was not previously thought to have ever left
Africa. The first modern human migration
from Africa was believed to have occurred around 65,000 years ago, with small
bands of our early ancestors migrating out of Africa via the coastal routes
through the Middle East and maybe making the short sea crossing to Arabia. If the ‘hobbits’ were descended from
Australopithecus it meant that Australopithecines possessed hitherto
undiscovered seafaring abilities and also that they possibly migrated out of
Africa into Asia millions of years
before any species of human was thought to have done? Mike Morwood has now
uncovered stone tools on nearby Sulawesi that could be almost 2 million years
old, so will more H. floresiensis skeletons and archaeological artefacts be discovered
that could provide further vital evidence?
There are some experts who argue that the controversial ‘hobbit’
remains are just modern human skeletons that are somehow abnormal and that the
individuals suffered from a disease such as microcephaly that leads to small
brain sizes. However, all of the ‘hobbit’
skeletons display the same features and that they are just too different from
modern humans to simply be diseased modern humans. What might be able to settle the argument is
if some mitochondrial DNA is recovered from the H. floresiensis specimens and
sent for analysis. However the hot, damp
climate of the Liang Bua caves reduces the chances of it being recovered, as
extreme heat degrades DNA. In addition,
the bones were not fossilised, which also does not help DNA recovery.
Hopefully, future discoveries will throw further light on
where the ‘hobbits’ came from and how they evolved. Also, they may give us more
information on when the first humans really did leave Africa to spread to other
parts of the world. Of course, the most amazing thing would be if a population
of diminutive ‘hobbits’ were discovered to be still living today deep in the
tropical jungles of Indonesia, and then suddenly we would not be the only human
species alive on our planet today.
H. floresiensis skull image FunkMonk Wikimedia Commons Creative Commons Attribution Share Alike 2.0 Generic