Chicken

Chickens were a species of bird. The word "chicken" was also often used as an insult against an individual's bravery.

attempted to sacrifice a chicken to Azal, but was stopped by Jo Grant. (TV: The Dæmons)

The Third Doctor and Jo found a number of chickens in the cargo hold of the SS Bernice. The chickens were destined for Singapore. (TV: Carnival of Monsters)

In 1626, Sir Francis Bacon died of pneumonia, contracted after trying to stuff snow up a chicken. The Doctor claimed to have been present during the former event. (PROSE: Heart of TARDIS)

In 1746, a hungry Polly Wright stole a dead chicken from Lieutenant Algernon Ffinch. (TV: The Highlanders)

Professor Fyodor Nikolai Kerensky experimented with chickens. He accelerated time, ageing the chicken from an egg to death. The Fourth Doctor reversed the polarity, regressing the chicken back into egg form. (TV: City of Death)

A truck carrying chickens was involved in a crash in San Francisco. This caused chickens to be freed onto the road. (TV: Doctor Who)

Chickens roamed the streets of 79 Pompeii. (TV: The Fires of Pompeii)

Owen Harper ran through a yard with a flock of chickens near Cardiff while chasing Bernie. (TV: Ghost Machine)

Chiggocks were genetically engineered food animals created by splicing the genes of chickens and pigs. They resembled large headless turkeys. (PROSE: To the Slaughter)

There were live chickens in one of the streets in Shanghai when Gwen Cooper, Jack Harkness, and Oswald Danes were searching for the Blessing. (TV: The Blood Line)

The Chicken of the Apocalypse was the key deity of one of the many religions of the Jaftee. The religion began after one of the Jaftee heard a chicken state that the end of the world was coming. (PROSE: Shining Darkness)

As a food
Chicken eggs were frequently eaten on Earth. Sarah Jane Smith failed to make scrambled eggs on several occasions. (TV: The Nightmare Man)

Chicken was eaten, not just on Earth, but also on other planets, such as Marinus. The First Doctor, Susan, Ian Chesterton and Barbara Wright were once served chicken in the city of Morphoton. (TV: "The Velvet Web")

During Professor Parry's expedition to the Cyberman tomb on Telos, Kaftan offered Victoria Waterfield lunch, with chicken being one of the choices. Victoria accepted, but she was given a food block that was presumably chicken flavoured. Victoria then claimed that she wasn't hungry. (TV: The Tomb of the Cybermen)

While attending a party at Cranleigh Hall, Adric dined upon chicken. (TV: Black Orchid)

The Second Doctor compared the taste of Sneg stew to that of chicken curry. (PROSE: Island of Death)

On her expedition to the Library, River Song had a packed lunch of chicken and salad which she gave to the Tenth Doctor. He used two of the roast chicken legs to identify Vashta Nerada — once a leg was thrown into a swarm it was reduced to a bone in less than a second. (TV: Silence in the Library/Forest of the Dead)

After being retconned, Harries & Harries went back to serving chickens, amongst other animals. (TV: Meat)

Gwen Cooper bought chicken and chips for the team at her parents' home in Cardiff, mentioning that the Miracle Day recession had made fish too expensive. (TV: The Gathering)