walk-It-dolphins lives in the river-systems of the walk, Indus and Brahmaputra. they hike as far as into flat influxes far upstream, is to be found (modern barrages hinder this hike in some areas) also at the estuaries, however. The hikes are subject to seasonal fluctuations. During the monsoon-time, the rivers swell very strongly namely so that the dolphins of protected side arms and quiet influxes visit, in whom also the combination and (during the next rain-period) the birth of the young take place.
Physique Walk-It-dolphins become 2-3 m long and approximately 60 kg heavy. Male animals have a shorter beak than the females. The back is gray-black colored flat and comb-nicely protracted darker as the stomach-side, that is back-Finn. The head-region with its high forehead-part and the 18-21 cm long jaws is conspicuous. On each side, 28-29 teeth stand in the waiter and lower jaw. The neck-region is well recognizable, walk-It-dolphins can move its head rather far.
The eyes of the walk-It-dolphins are largely receded in adaptation to the continually cloudy water of its home-like rivers with "visibilities" of few centimeters. The eyes are only pea-big and lie sunk approximately 0,4 cm in the body. A lentil is missing completely, the eye-muscles and the optic nerve (diameters 0,06 cm)!) wasted away. The pupil is 0,15 cm in the diameter, the entire eye-opening only 0,2-0,3 cm wide.
In accordance with its "blind" way of life, the brain of the walk-It-dolphins is specialized on the acoustic bearings. The corresponding brain-sections and also the hearing-nerves are considerably trained, the optical and placed above associative centers are small (with 250 g brain-weight, these whales have the smallest brain of all tooth-whales) on the other hand.
Walk-It-dolphins swim in side-situation and get the bearings to the light water-surface with the eye to, that still perceives brightness-differences well. A flipper holds constantly feeling contact to the underground.
Echo-sounder Walk-It-dolphins are as all Flußdelphinartigen, harmless and curious animals, live together it in troops of 3-10 individuals and live from fishings, that track it down with its high-specialized sonar-system. This echo-sounder-orientation takes place through ultrasound - "Clicks" (d). h. very short signals, that is generated in the larynx and experiences an effective Bündelung through the high bone-combs of the forehead-part and underlying airspace-systems to the front. In quiet mood, the dolphins give away 20-40 Clicks per second however, what can increase up to 90 units for itself with arousal in the second.
Way of life Because of the difficult homestead-observation of the cloudy water is not much known over the habits of these dolphins unfortunately. they appear every 1-2 minutes to breathing, because of the sound emerging with it, one calls also "Susu" it in India.
Reproduction After 9-11 months, heavy, toothless boys come to the world the 70-80 cm long ones and 7 kg in April until July. they are nursed approximately 9 months, with which Entwöhnung are, grown up it on 1 m, twins are extremely rare.
Endangering Walk-It-dolphins are hunted isolated, its muscle-meat and its bacon are eaten, its oil serves as lamp-fuel and is regarded as panacea in addition. The onward destruction of its habitat, through barrages u. ä.) endanger it survived of these particular whale-shapes.
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