Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.061.

Malik said: “The best thing that I heard concerning this matter is that the price of the killed game must be assessed, or the food that can be bought with that amount. Then the killer must give to every needy person one mudd of food or else he must fast an identical number of days, one day for each mudd (of food). He must estimate the number of the needy that could be fed with that food. One must fast ten days if the money could feed ten poor people, fast twenty days, if twenty people could be fed for that amount, and so forth whatever their number, even sixty or more.”