In the Green Martian clan otherwise known as the Tharks they reproduce in a form where the offspring are separate from their parents. Once hatched and ready the hatchlings are brought back to the clan in anonymity where women randomly grab one to raise as their own.
Tars Tarkas the Jeddak (chieftain) knows somehow that Sola is his daughter. Tars says something to John Carter letting him know how Tars tracked Sola. When John Carter told Sola Tars was her father, she was shocked. She had no idea he was her father.
I couldn't understand exactly what happened in the exchange between John Carter and Tars or how Tars was able to figure out Sola was his daughter.
How was Tars able to track and figure out that Sola was his daughter?