...The same thing occurs with grey horses, which, as long as they are foals, are generally of a nearly black colour, but soon become grey, and get whiter and whiter as they grow older... 
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Calves and foals are lessfrequently affected with rickets than dogs and pigs...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...To savethe foals that were now standing up to their bellies in waterseemed to be the object of their consultation...
Various 「Natural History in Anecdote」
...A mare foals...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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