Animals:
* fish: (one fish, many fish)
* sheep: (one sheep, many sheep)
* deer: (one deer, many deer)
* series: (one series, many series)
* species: (one species, many species)
* corps: (one corps, many corps)
Other:
* trousers: (one pair of trousers, many pairs of trousers)
* scissors: (one pair of scissors, many pairs of scissors)
* jeans: (one pair of jeans, many pairs of jeans)
* shorts: (one pair of shorts, many pairs of shorts)
* pants: (one pair of pants, many pairs of pants)
* eyeglasses: (one pair of eyeglasses, many pairs of eyeglasses)
* sunglasses: (one pair of sunglasses, many pairs of sunglasses)
* knickers: (one pair of knickers, many pairs of knickers)
* tights: (one pair of tights, many pairs of tights)
* pliers: (one pair of pliers, many pairs of pliers)
* binoculars: (one pair of binoculars, many pairs of binoculars)
* scales: (one set of scales, many sets of scales)
* stairs: (one set of stairs, many sets of stairs)
* earnings: (one set of earnings, many sets of earnings)
* goods: (one set of goods, many sets of goods)
Important Note: While some of these words can be used in the singular (like "a pair of scissors"), their plural forms represent the actual meaning of the word.
It's also important to remember that English grammar can be tricky, and there are always exceptions! Some words that appear to be plural in form might not always be plural in meaning. For example, "data" is often treated as a singular noun despite its plural form.