2. They're a little sneaky.
Male cuttlefish have four tentacles, and female cuttlefish have three. Certain male cuttlefish actually tuck one of their tentacles in so they can fool other males into thinking they are females, and consequently steal their mates. This may be a bizarre brand of logic, but that's just how this curious cephalopod rolls!
3. They're light as a feather.
Cuttlefish have a shell, but it is actually inside their bodies. This shell is called the cuttlebone, and is actually what makes the cuttlefish so buoyant, as it is filled with gas. This important cuttlefish trait distinguishes them from their squid cousins.