The average adult chicken weighs between 5 and 10 pounds. Roosters are usually larger than hens, and egg-laying chicken breeds are usually smaller than meat or mixed type breeds. A fryer, or meat chicken, will usually weigh to 5 pounds at slaughter.
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There are nearly 20billion chickens in the world - all the same species. Like dogs, chickens have thing as average. A normal range of weights can be anything.