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1976, Richard Dawkins, The Selfish Gene, Kindle edition, OUP Oxford, published 2016, page 168:
Sometimes, as we have seen, one member of a litter is a runt, much smaller than the rest. He is unable to fight for food as strongly as the rest, and runts often die. We have considered the conditions under which it would actually pay a mother to let a runt die.
Jacob Poole (d. 1827) (before 1828) William Barnes, editor, A Glossary, With some Pieces of Verse, of the old Dialect of the English Colony in the Baronies of Forth and Bargy, County of Wexford, Ireland, London: J. Russell Smith, published 1867, page 65