This report is not quite exhaustive...
I was originally interested in cuttlefish from "Sunday school" /youth group, when my leader put on a video about different animals that defy evolution. The next day was the first day after Christmas break, and in the morning, Ethan and I really didn't want to do school (I know, we are spoiled) My mom said since I was so fascinated by cuttlefish, that I could write a report on them for school, so I did.
My exhausting report on
Cuttlefish
Cuttlefish are amazing creatures. Sometimes called, “the chameleon of the sea” because of their incredible ability to change color in a split second.
Cuttlefish tend to range in size from 15cm to 25cm; their life span is about 18-24 months. Their diet consists of mollusks, crabs, shrimp, fish, octopus, worms, and even other smaller cuttlefish.

The scientific name for a cuttlefish is sepia. Sepia ink was used by artists for their paintings. For cuttlefish, this ink is a means of escape from predators.
If a large fish were to attack a cuttlefish the cuttlefish would eject a cloud of dark brown ink towards its attacker, which would coat its nostrils. Meanwhile, the cuttlefish is hidden from view and propels itself using a siphon which forcibly expels water and moves the cuttlefish backwards.

During mating season, some male cuttlefish use sexual mimicry to successfully impregnate females.(1)
The male to female ratio is about four to one but can get as high as eleven males to one female. Because of this, consort males (males with female partners) guard their mate almost constantly.
Large consort males mate the most; forcing smaller males use trickery and mimicry to mate at all. The techniques used by small males include waiting until the consort male is distracted by repelling other competition, waiting for females under rocks, or making themselves look and act like females to get close to females. When mimicking they get close to females about half of the time.
To mimic females, males hide their fourth arms, adjust the pattern on their skin, and act like egg-laying females. Shortly after spawning, females become lethargic and their body quickly deteriorates.
The eggs are laid in clumps and are coated in ink from the mother; this serves as a camouflage for the eggs. It takes 14 days for the eggs to develop and they hatch at a much further developed stage than an octopus. They immediately start feeding on suitably small shrimp.
1. Senior scientist Roger Hanlon and his colleagues at the Marine Biological Laboratory