Piranha

 Piranha ~

•  a deep-bodied South American freshwater fish that typically lives in shoals and has very sharp teeth that are used to tear flesh from prey
• It has a reputation as a fearsome predator 

Shoals ~ a large number of fish swimming together.

Oxford Dictionary, p 1411 (piranha), p 1718 (shoals)

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कायेन वाचा मनसेन्द्रिऐवा बुध्यात्मना वा प्रकृते स्वभावात। करोमि यद् यद् सकलं परस्मै नारायणायेति समर्पयामि।।
Kaayen' Vaacha Mansendriyaiva Budhyaatmana va Prakrite Svabhaavaat';
Karomi Yad Yad Sakalm Parasmai Naaraayanaayeti Samarpayaami!