Chicken

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

According to the Fifth Doctor, the second oldest question, after the more notable first, was "Why did the chicken cross the road?" (AUDIO: The Second Oldest Question)

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

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 1215, chickens were kept at Fitzwilliam Castle. Sir Geoffrey de Lacy rode past a group of chickens while leaving the castle. (TV: The King's Demons)

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)

Squire kept chickens in his barn. A UNIT soldier nearly shot one while searching the barn for a Silurian. (TV: Doctor Who and the Silurians)

In 1979, 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)

In December 1999, a truck carrying chickens was involved in a crash in San Francisco. This caused chickens to be freed onto the road. (TV: Doctor Who)

Owen Harper ran through a yard with a flock of chickens near Cardiff while chasing Bernie Harris. He spooked them, and at least one took (rather clumsy) flight. (TV: Ghost Machine)

In 2018, Ramón Salamander's chef Griffin cooked a chicken while with Salamander in Hungary. He told Fariah Neguib it was browning too soon, which would cause it to be "as tough as rubber". (TV: The Enemy of the World)

Chickens were present in the market square of Joycetown on Heaven. They were startled by the arrival of the Doctor's TARDIS. (PROSE: Love and War)

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)

By 292,009 Chickens were extinct. (PROSE: The Eyeless)

At some point, the Eleventh Doctor owed Casanova a chicken as part of a "bet". While in Venice in 1580, he lamented that Casanova wasn't born for 145 years so he wouldn't have to run into him. (TV: The Vampires of Venice)

When the Thirteenth Doctor and Yasmin Khan were trapped inside a joke book, the Doctor suspected it had something to do with "that chicken crossing the road", before citing that they had suspicious eyes. (PROSE: Knock! Knock! Who's There?)

Consumed by other species
Chicken eggs were frequently eaten on Earth. Sarah Jane Smith failed to make scrambled eggs on several occasions. (TV: The Nightmare Man) The Tenth Doctor's Timey-wimey detector once made a carton of chicken eggs explode. (COMIC: A Little Help from My Friends)

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 in the 25th century, 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 on 11 June 1925, 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)

Glune Fex Fize Sharlaveer-Slam Slitheen claimed that human children had a stench of Haribo and chicken nuggets. (TV: Revenge of the Slitheen)

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)

Roast chicken was a flavour of crisps. (AUDIO: The Hope)

Chicken was a main ingredient in chicken tikka. (PROSE: Hospitality)

Other references
Singing The Riddle Song, Bliss recited the line "I gave my love a chicken, it had no bone" Immediately after absorbing Ursula Blake in 2007, long after he had Bliss, the Abzorbaloff commented that she tasted "like chicken." (TV: Love & Monsters)

In 2050, Starkey accused Darius Pike of being "chicken", referring to cowardice. (TV: Liberation)

During the Attack on the Cathedral of Contemplation, the Tenth Doctor mockingly referred to the Dalek Supreme as "Chicken Supreme" in response to its cowardice, much to the amusement of the Fourth Doctor. (AUDIO: Out of Time)

Sam Jones once asked if all Time Lords tasted of chicken or if it was just The Doctor after he held his hand over her mouth and she tasted it. (PROSE: Alien Bodies)

Information from non-valid sources
The Colossus Chicken of Gigantus, a chicken-like alien, was the archenemy of Doctor Why. (TV: Hallo My Dalek)

A chicken was behind a Nether Portal when a Red Dalek exited to pursue the Twelfth Doctor. (WC: Doctor Who Comes to MINECRAFT!)

A framed portrait of a chicken was present within the Diaz Household, near the door to the garden. (TV: Untitled)