saltwater crocodile
US /ˈsɔːltˌwɑː.t̬ɚ ˈkrɑːk.ə.daɪl/
UK /ˈsɔːltˌwɑː.t̬ɚ ˈkrɑːk.ə.daɪl/

1.
a large reptile found in coastal waters and rivers of Southeast Asia and northern Australia, known for its aggressive nature and being the largest living reptile
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The tour guide warned us about the dangers of saltwater crocodiles in the area.
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A large saltwater crocodile was spotted near the riverbank.