1. GUANO ( Bird excreta )

2. For 11 th standard Economic Zoology: Guano. Guano is the accumulated excrement or droppings of fish eating sea birds such as gannets, cormorants and pelicans. It has been used as a fertilizer. These sea birds populate some islands off the west coast of Peru, lower California and Africa.

3. For 11 th standard Economic Zoology: Guano. Their population strength may go up to 5,600,000 per square mile. They may consume 1000 tones of fish daily. Exports of guano from the Peruvian deposits began in 1810 and reached 50,000 tones in 1856.

4. For 11 th standard Economic Zoology: Guano. The Government protects the sea fowls and processes the guano which about 11 to 16 % nitrogen, 8 to 12 % phosphoric acid and 2 to 3 % potash. The fertilizing properties of the phosphoric acid and nitrogen contained in fish were not recognized until the guano became a stimulus to intensive agriculture. The real guano is found in vast stratified accretions on rainless islands off the coasts of Peru.

5. For 11 th standard Economic Zoology: Guano.