The great cormorant is, as the name suggests, the largest species of cormorants in Romania.
Read below and find more information.
It is common all along the Danube, especially in areas where the Danube forms puddles of overflow. The highest concentration of cormorants is found in the Danube Delta.
The plumage is shiny black. Belly and chest feathers have small blue metallic reflections. White spots appear on the cheeks and hips areas. Feathers on back and wings are well differentiated, like scales.
Both partners shed in December and after this, they get a very beautiful plumage, but they shed again in midsummer.
The bill is bented and strong, white on the bottom and black on top, with yellow shades to the base. The tip is bent down as a hook.
The nasal holes are not visible and the nasal cavity is almost inexistent. These features prevent water to penetrate the respitory system, when the bird has its head into water.
The great cormorant eyes are green.
Big and powerfull thumbs joined by an interdigital membrane thicker than the ducks, geese and pelicans.
While flying, the great cormorant keeps its neck extended and the flock is straight or V-shaped.
The great cormorant is both a good swimmer and a diver (it can stay under water up to 70 seconds).
Cormorants fish only under water, where they pursue their prey with their eyes open and the wings tightly to the body.
Lenght: about: 80 – 100 cm.
Wingspan: 130 – 160 cm.
Weight: 2 – 2.5 kg.
Cormorants diet consists almost entirely of fish. A great cormorant can hunt 2 to 3 kg of fish daily.
The great cormorants are considered extremely harmful birds for the fishery, both because of the large amount of fish they consume a single day and because they breack nets, causing significant damages.
Did you know...
Cormorants name comes from latin „Corvus marinus”, although they have no connection with the corvids family? The cormorants are part of the pelicans family.
Cormorants can dive up to 25 meters depth and they reach impressive speeds when pursuing their prey?
The fish is swallowed, always headfirst.
In asian countries, cormorants are used for fishing?