Ant
Ants were a species of insect native to Earth.
Ants were used as food in the Roman Empire. While in Rome in 64, the Doctor and his companions enjoyed a meal which included ants' eggs in honey prepared by Barbara Wright. (DW: The Romans) In Pompeii in 79, Lucius Caecilius Iucundus ordered some ants in honey with a dormouse. (DW: The Fires of Pompeii)
In 1190, Ibrahim and his bandits tried to force Ian Chesterton to reveal where his money was hidden by staking him in the desert and daubing him with honey to attract ants. (DW: The Crusade)
In 1964, DN6 was tested in Forester's garden, killing all the ants along with all the other animal life. Susan and Ian later discovered the dead ants. (DW: Planet of Giants)
In the 1970s, ants were among the species of insects which grew to giant size due to exposure to an improperly mixed pesticide spray. They were returned to their normal size by the Doctor. (TVC: Insect)
In the 25th century, a race of ant-like robots began attacking passenger ships in space. (NA: Set Piece)
On Mercury, Andy Stone trained an army of ants to carry rust and spread it among the Daleks. (DWA: The Dalek Book)
In 5000, Elric Penley unfavorably compared Earth civilisation to an ant-heap that rejected individuality. (DW: The Ice Warriors)
In the year 50 million, Earth was home to two warring species of robot ants. (ST: Earth)
The Zarbi of Vortis resembled giant ants. (DW: The Web Planet)
