1,000,000 chickens would form a massive group covering 1,518 ft (463 m) by 1,084 ft (331 m). To help you picture this, they cover about 8 times the area of a city block.

Together they weigh
2,756 US tons
2,756 US tons (2,500 tonnes)
covers about 8 times the area of a city block
Sizes and weights are typical for an adult or standard chicken; real ones vary. Standing close together, not packed in.