Reef squid are quite interesting to watch. They can rapidly change the texture and color of their skin, not only for camouflage, but also to communicate. Especially at dawn and dusk, the common mating hours, squid can be seen displaying a range of colors and patterns at amazing speeds. It is even possible for a squid to display one pattern to a male squid on his left while displaying another pattern to a female on his right. They are quite fascinating!
In addition to changing the pigment of their skins, squid also use their body shape to communicate. They may point their bodies vertically when striking prey or curl up during hostile situations. They love to eat, and use their two long tentacles to catch small fish, crustaceans, and other mollusks.
Reef squid are typically not bothered by snorkelers. Some are shy, but others may be curious as to your presence, and quite bold when it comes to getting to know you.