今日のテキスト HOMINID LUCY 'DIED IN TREE FALL'

Researchers from the United States and Ethiopia say one of the best-known human ancestors may have died after falling from a tree.
The group of scientists carried out a study of what killed Lucy, a female hominid who lived in Africa about 3.2 million years ago. She was a member of an early human species.
Lucy's skeleton, which is about 40 percent complete, was unearthed in northeastern Ethiopia in 1974. The fossil is regarded as an important specimen for studying human evolution.
The researchers used a CT scan to analyze the remains, and found upper arm, ankle and pelvis fractures. They said her internal organs likely were also damaged. They said the injuries indicate that Lucy fell from a height of more than 12 meters.
The researchers say the findings appear to back a theory that while early human species walked upright on the ground, they also spent nighttime in trees.