TED-Ed: Claws vs. nails | Matthew Borths

The video explores the evolutionary journey from claws to nails, highlighting their shared keratin composition and differences in shape due to bone structure. Nails evolved from claws, offering primates advantages in dexterity and grip, crucial for survival in forest canopies. The video also discusses unexpected uses of claws and nails in various animals, emphasizing their diverse roles in the animal kingdom.

What is the primary material that both nails and claws are made of?

• Collagen

• Keratin

• Chitin

• Calcium

What evolutionary advantage did nails provide to primates living in forest canopies?

• Improved swimming ability

• Better camouflage

• Enhanced grip on branches

• Faster running speed

How do nails contribute to the sensitivity of primate digits?

• By providing a soft surface

• By reducing friction

• By offering an extra surface to detect pressure changes

• By increasing blood flow

What is one reason why claws might not be suitable for primates with wide fingers?

• They grow too slowly

• They are not sharp enough

• They interfere with gripping tasks

• They are too heavy

How do manatees use their nails?

• To dig burrows

• To defend against predators

• To grasp food

• To climb trees

What unique adaptation do the aye-ayes of Madagascar have?

• Reacquired claws

• Venomous bite

• Webbed feet

• Color-changing skin

What is a potential function of elephant toenails?

• To regulate temperature

• To store fat

• To sense ground vibrations

• To help them swim