Shelling

Dolphins use the technique called shelling to capture the tiny fishes into empty shells.
This method of tool use has been learnt from their peer groups and not from their mothers. This shows how dolphins adapt to the changing environment.

Freshwater Dolphins

The four freshwater dolphins in the world are:

The ‘Baiji’ is now likely extinct from the Yangtze River in China,
The ‘Bhutan’ of the Indus in Pakistan, and
The ‘Boto’ of the Amazon River in Latin America.
The Gangetic Dolphin/ ‘Susu’ in Ganges-Meghna-Brahmaputra and Karnaphuli-Sangu river systems in India, Nepal, and Bangladesh.

These four species live only in rivers and lakes.
Its presence indicates the health of the riverine ecosystem.

Source: TH

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