CLASSIFICATION = The number of cetacean species and the positioning of the single mammals inside the species, is in constant evolution for the presence of contrasting opinions between the biologist and for the new discovery of species; currently 78 are the cetacean species, of which 67 odontoceti and 11 misticeti, re-united in 9 families and 40 Groups.

LENGTH = The length of the cetaceans has enormous variations in relation to the species; the smallest measure less than the height of a man (for example 1.4 mt the common Focena, the Cefalorinco di Hector and the Lagenorinco), in order to catch up the length of the biggest (for example 33 mt of the Blue whale) would be necessary approximately 19 layed down persons one in continuation to the other.

WEIGHT = Therefore like for the length, the weight varies in relation of the species and sometimes of the sex of the cetaceans. It can be, in adult exemplary, from the few tens of kilograms (for example approximately 40 Kg the Pontoporia and the Sotalia) to the hundreds of tons (160 t the Blue whale - equal to approximately 2200 men or 30 elephants -, 100 the Right Whale, 80 the common Finner). The heart of the Blue whale approximately 550 Kg, the liver 1 t and tongue 350 Kg.

LONGEVITY = The less long-lived cetaceans live approximately ten years (for example approximately 10 years the Focenoide), the most long-lived ones can catch up an age similar to the human (90 years approximately for the Blue whale).

LONGEST IMMERSION = The champion of duration of the apnea of the cetaceans is sure the Sperm Whale that can remain without to breathe until 2 hours and 20 minuteren approximately.  

DEEPER IMMERSION = the Capodoglio wins also as the caught up maximum depth, is thought in fact that it can go down until - 2300 m and probably beyond. ;

MAX SPEED = The common dolphin can swim to 65 Km/h, the killer whale 50 Km/h and the blue whale 48 Km/h.

LONGEST FANONI = The Balena of Groenlandia can have fanoni of 4 m the blue whale 1 mt, this difference are due to various predating behaviors.

BIGGEST TEETH = The killer whale possesses teeth that can exceed 20 cm of length and 1 kg of weight; the Narvalo possesses a tooth that can catch up the amazing length of 3 m .

FASTEST GROWTH = During its first six months of life the baby of Blue whale grows to the incredible rhythm of 110 Kg. the day, thanks to the daily 400 lait liters that the common finner receives from the mother (its accumulate weight for approximately 60 kg the day) .

QUANTITY OF FOOD = The Blue whale every day is not satiated if it does not eat 4.000 kg of Krill.  

DISTANCE CAUGHT UP From the SOUND = In spite of the studious is not uniforms on the real distance that the sounds emitted from the whales can catch up, and believing that the propagation of the sound in sea at the same time is facilitated from the liquid and contrasted from many factors of disturbance, someone thinks that they can chat to 900 km of distance.