This 2015 video says about itself:
Animals Documentary: SUPERCROC, THE DINO HUNTER Special National Geographic.
Some hundred million years ago, crocodiles were the ruling T. rexes of the waters. They galloped on land, ambushed prey at the river’s edge—even terrorized dinosaurs. These swift predators evolved through the ages into the modern crocs we know today. Now, armed with newly discovered prehistoric crocodile bones, Dr. Paul Sereno is determined to bring the ancient creatures to life—and tell their fantastic untold story.
From the University of Iowa in the USA:
Crocodiles have complex past
January 24, 2019
Summary: A new study offers a different version to the evolutionary past of modern-day crocodiles and alligators. The study says crocodiles and alligators came from a variety of surroundings beginning in the early Jurassic Period, and various species occupied a host of ecosystems over time, including land, estuarine, freshwater and marine.
A new study throws into question the notion that today’s crocodiles and alligators have a simple evolutionary past.
Previous research has pointed to crocodiles and alligators starting with a land-based ancestor some 200 million years ago and then moving to fresh water, becoming the semi-aquatic ambush predators they are today.
But a new analysis, published online today in the journal Scientific Reports, offers a different story. Modern crocodiles and alligators came from a variety of surroundings beginning in the early Jurassic Period, and various species occupied a host of ecosystems over time, including land, estuarine, freshwater and marine.
As University of Iowa researcher and study co-author Christopher Brochu says, “Crocodiles are not living fossils. Transitions between land, sea, and freshwater were more frequent than we thought, and the transitions were not always land-to-freshwater or freshwater-to-marine.”
Brochu and colleagues from Stony Brook University pieced together crocodile and alligator ancestry by analyzing a large family tree showing the evolutionary history of living and extinct crocodylomorphs (modern crocodiles and alligators and their extinct relatives). The team was then able to predict the ancestral habitat for several divergence points on the evolutionary tree.
This suggests a complex evolutionary history not only of habitat, but of form. Those living at sea had paddles instead of limbs, and those on land often had hoof-like claws and long legs. These did not all evolve from ancestors that looked like modern crocodiles, as has long been assumed.
The iconic ‘death roll’ of alligators and crocodiles may be more common among species than previously believed, according to a new study: here.