There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
One factor would be, who suprises who first.
In water a jaguar wouldn't stand much of a chance against a nile or saltwater crocodile or a rather big aligator. On land it will be closer i highly doubt that a jaguar would kill a fully grown nile or saltwater crocodile cuz of the size weight advantages and crocodiles are also intelligent killers.
A jaguar could be capeable of killing crocodiles/alligators of up to 4 meters everything above would be a to high risk and could end up being killed itself.