article_snippet: Chicken sexers: Workers spot the 'minuscule differences' in the size and shape of each one-day-old chick's genitalia - known as its 'vent' - to determine whether it will be a rooster, or will one day lay eggs .
article_snippet: Each future 'chick sexer' receives years in training in how to spot 'minuscule differences' in the size and shape of a newly-hatched chick's genitalia to determine whether it will be a rooster or a hen.
article_snippet: They are expected to be able to sort between 800 and 1,200 day-old old chicks an hour - between three and five seconds a chick - with an accuracy of 97 or 98 per cent.
article_snippet: And each chick must have each chick genitalia - known as each chick 'vent' - checked without being harmed, Mr Large told The Times.
article_snippet: Delicate: Each chick must be handled with care .
article_snippet: Mr Large told The Times: 'It takes three years to train someone so they  develop the sensitivity and dexterity to reliably sex the bird and a lot of people don't want to spend that amount of time training. '
article_snippet: Chick sexing has previously made headlines as a number of the birds - mainly male - are discarded and killed if they are surplus to the requirement of the order.
article_snippet: Waiting to be checked: Chick sexers are expected to be able to sort between 800 and 1,200 day-old old chicks an hour - between three and five seconds a chick - with an accuracy of 97 or 98 per cent .
highlights_snippet: chicks train for three years to learn how to examine up to 1,200  birds an hour .
  