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Herein, do monkeys bite their nails?

Both. Many primates bite their nails. Chimpanzees, for example, usually bite their nails; some prefer to leave them alone. They do grow continuously, and nails not kept trimmed probably break off (looking at the thickness of those nails, I get the impression that this might be rather painful if they break too short.)

One may also ask, what is the purpose of fingernails and toenails? Fingernails and toenails also help to pick up objects and grasp them more firmly. Nails allow people to pick, scratch, peel, grab, climb, dig, tear and a variety of other tasks. Being able to manipulate things with our fingernails allows humans to do much more than without them.

Simply so, why do monkeys have nails?

"[They] use them to grab onto things, to climb things, to scratch things, and to dig holes." Scientists suspect primates sort of lost their claws and fashioned broad fingertips topped with nails to aid in locomotion.

Why do we need nails?

But your nails have a job to do. The hard surface of your nails helps to protect the tips of your fingers and toes. And your fingernails make it easier to scratch an itch or remove a dog hair from your sweater. Nails themselves are made of keratin (say: KAIR-uh-tin).