Scientific name: Monodon monoceros
Narwhals are a kind of medium sized whale that has a long tusk growing from the middle of their head, like a unicorn's horn. They live in the northern part of the world, in the arctic waters.
Scientific name: family salamandridae, subfamily pleurodelinae
Newts are a member of the salamander family. Newts have three stages as they grow - larval, juvenile and adult.
Nits is the common name given to the eggs of human head lice. The lice lay their eggs attached to the hair, which you can see in the picture. Nits aren't much thicker than your hair, and can me mistaken for dandruff.
The Norwegian forest cat is from northern Europe, and has developed a very thick, fluffy coat to adapt to the cold weather there. They are very large cats that enjoy people's company.
A nymph is a larval stage many kinds of insects go through. Nymphs tend to be quite similar to the adult insect, unlike insects like butterflies that have very different larval stage. Nymphs gradually grow to full size, shedding their skin each time they outgrow it, and the final time they shed their skin they make the transformation to their adult form.