Tahir Kelmendi sifted through the charred pieces of furniture and clothing and found another bone, held it up and broke it. The bone was light in weight and snapped crisply.
"This is from a person," he said.
Animal bones were heavier, harder to break, he explained.
Between 20 and 30 armed Serbs came to Coska on the morning of May 14th and forced 100 people from five families out of their homes, according to the Albanians in this tiny village outside Pec, in south-west Kosovo.
In a scenario which has become grimly familiar in the Yugoslav wars, the men were separated from their families.
Women and children were locked inside a large, walled compound with a steel gate. The men were then divided into three groups, each of which was taken to a different house for summary execution.
When it was over, 43 men from five different families were dead.
"I buried 32 of them myself; nine of them were my relations," said Mr Kelmendi.
The testimony of refugees and Albanians who remained in Kosovo during the war indicates that many more mass graves will be found, the macabre legacy of Serb "ethnic cleansing".
Investigators from The Hague War Crimes Tribunal have visited Coska, a village where muddy, rutted tracks run between the farmhouses. Mr Kelmendi seemed surprised by the sudden attention, and determined to convince us that his horrible story is true.
Amid the ashes were bullets, metal buttons from a pair of jeans and a blackened gold wedding ring. The villagers recognised it as having belonged to Ismet Dinaj (32), from the nearby village of Raushiq.
He and his wife, Sanija, had been visiting Coska the morning the Serb forces came and he was shot and burned with the others.
The villagers promised to return the ring to Sanija.
Two large mounds stand in the field at the end of the road, decked with plastic flowers, real roses and tinsel Christmas tree garlands.
"I buried two bodies that weren't burned in the far mound," said Mr Kelmendi. "The bones of 30 burned men are lined up in the near one."
Isa Gashi, a worker at the nearby Zastava factory, was sent with one of the three groups for execution.
"They put us in a room with four policemen," he said. "They told us: `If you want to survive, you must give us money and gold.'
"We said: `But we already gave you all our money.' Then they opened fire. A bullet went through my thigh."
Mr Gashi wore the same trousers in which he was wounded, and showed us the holes in the cloth on both sides of the leg.
"After they shot us they set fire to the house. I pretended to be dead, and when the flames came near I ran away."
Why did the Serbs go to the trouble of burning the bodies of their victims?
"They wanted to destroy the evidence," said Mr Kelmendi.