Step 10: Determine the Sizes of the Flocks in the Second Generation Flock X Flock Y Flock Z Total Pieces of Food Eaten 57 153 90 Food Percentage* 19 % 51 % 30 % Simulated Number of Birds in Flock for 2nd Generation** * Divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** Multiply the food percentage for each flock by the total number of birds (30).