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He had 1,142 yards passing and 12 touchdowns, then broke his tibia and fibula, tore ligaments in his foot and dislocated his ankle all on one play when tackled.

Mr McGarry, now 19, sustained a fractured left tibia in the crash, which required surgery.

Lanoë and his colleagues unearthed a tibia, or lower-leg bone, of an adult canine in 2018 at a longstanding archeological site in Alaska called Swan Point, about 70 miles southeast of Fairbanks.

"Under the meat of a drumstick, you'll find two bones -- the tibia, which is long and thick, and the fibula, which is much shorter and thinner," Manafzadeh explained.

He said the 13-week-old had suffered multiple serious injuries including abusive head trauma, retinal haemorrhage, extensive face and neck bruising and a fracture of the tibia.