Title: The Difference Between A Narwhal and Swordfish - KnowledgeNuts
Headings: The Difference Between A Narwhal and Swordfish
The Difference Between A Narwhal and Swordfish
What is their “spike” made of, anyway?
Fish vs Mammals
Where do they live?

Content: Still, asymmetric adaptation does happen (just look at the very photogenic fiddler crab .) Zoologists used to think the narwhal’s tusk is used to fight other narwhals, but now we think narwhals may talk to each other by touching tusks, and they can “tap” fish with them to stun them. A narwhal’s tusk grows between 1.5 and 3 meters and will weigh about 10 kilograms. Meanwhile, the swordfish’s “sword” is a long bill — basically, it’s their upper lip! The sword bone grows forward out of the swordfish’s skull and is not only very strong, it’s able to repair itself after breaking. Zoologists say the swordfish will not stab with its sword, as you might assume; instead, they slash with it, like a knife. Swordfish are predators, and are known for hunting lots of smaller fish; they’re also famous for their very high swimming speed. A large swordfish’s entire body can be almost 3 meters long — the same size as a large narwhal’s tusk — so you can see they have a size disadvantage.