A new Cuttle fish discovery...more Alien then we previous thought...almost from a sci-fi horror movie Alien...
© Gunther Deichmann
- Alien afternoon in Puerto Galera
Philippines, a great dive destination to see these Aliens... or
venture to Club Paradise in Palawan and dive with Dugong Dive
Center at their house reef you might encounter the yearly mating
behavior of these amazing marine creatures.
Cuttlefish spot target prey early...
By Matt Walker
Cuttlefish (Animal Behaviour)
Embryos exposed to crabs preferred them as prey later in life. It's a bit like something out of the famous sci-fi horror movie Alien.
Before they have even hatched, cuttlefish embryos can peer out of their eggs and spot potential prey. It is the first time any animal has been shown to learn visual images before they are born.
Ludovic Dickel and his colleagues at the University of Caen Basse-Normandy, France, made the discovery by placing crabs alongside cuttlefish eggs in a series of laboratory tanks.
Those embryos exposed to crabs preferred them as prey later in life, the scientists report in the journal Animal Behaviour.
The young embryos must be able to see through their translucent egg case, the scientists believe, and learn which animals are worth hunting even before they have hatched.
"This is the first time there is evidence of visual learning by embryos," said Dr Dickel.
Embryos are known to able to pick up chemical and auditory cues - unborn gulls, for example, learn to recognise the alarm calls of their parents whilst still in the egg, while salmon and frog embryos can learn the chemical signatures of the surrounding water before they hatch.
But until now, no one has looked at whether unborn animals can also learn visual images. Dickel and his team decided to study embryos of the cuttlefish Sepia officinalis, a relatively advanced ocean-going mollusc closely related to squid and octopus.
Majestic but deadly: Cuttlefish are efficient killers
They harvested wild eggs, and placed them in tanks filled with sea water. Crabs, a common prey of adult cuttlefish, were also placed into the tanks, but enclosed in separate compartments. Crucially, the compartment sides were made of clear glass, so the crabs were in plain view of the eggs.
But the embryos could not smell or hear the crabs. Once the cuttlefish embryos hatched, they were instantly moved, to ensure they could not glimpse the crabs, and were not exposed to any other prey until they were seven days old.
They were then set free in a lab tank full crabs and shrimp, another cuttlefish delicacy…read the complete story and some photos @