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The ancestors of mammals were the dominant terrestrial life form until the permian extinction which allowed archosaurs (dinosuars) to rule for almost 200million years.
Our ancestors were forced to survive as small rat like creatures bidding in burrows and only coming out at night.
All other terrestrial vertebrates have a gene that allows them to repair damaged DNA with sunlight but because of our nocturnal purgatory we lost this ability (among many other like our colour vision).
Birds are theropod dinosaurs and were the most responsible for this.

Therefore birds cause cancer and you have a duty to avenge our ancestors by eating them