The tour boat came across a bull shark being munched by a Saltwater crocodile, which then scurried back into the muddy water with its catch. Description from metro.co.uk. I searched for this on bing.com/images
Number 6 on Australia's deadliest animals list - The Salt-water Crocodile - Crocodiles are highly publicised for viciousness and aggression, along with looking scary, it is probably a surprise they are further down the list than you may have thought, this is because there are very few deaths per year - The longest croc ever measured and verified was 6.4m (21ft). It could have weighed more than 1000kg. In Australia, there are unverified reports of crocs up to 8m.
Australia ~ A Light Lunch - If a 5.5 meter crocodile eating a bull shark isn't intense, then I don't know what is. This croc is actually known on river tours as Brutus, and is distinctive for his immense size and his missing right forearm.