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OLD MACDONALD

Old MacDonald had a farm. And on that farm he had . . .

One animal with half as many letters now as it had when it was younger.

One animal with fewer letters now than it will have when it is older.

One animal with half as many letters as its plural.

One animal with the same number of letters as its plural.

And altogether the vowels they had were E-I-E-I-O (though not in that order). What were the animals?