QUOTE (Incorrigible1 @ Sep 17 2008, 09:11 AM)

Google is your friend.
DC, I'm curious about your statement, "And when the dinos were gone, crocs adapted into bipedal, fast running clones of carnivorous dinos like T Rex, and were the top predators until more efficient mammalian carnivores displaced them."
From what I've googled, it seems the bipedal crocodilians, crurotarsans, appeared in the Late Triassic, not after the KT event.
But you didn't 'google' far enough. True, some of the earliest crocodiians were bipedal, but were superceded by dinosaurs in those roles. But when the dinos were gone, crocodiles made an impressive comback as LARGE bipedal terrestrial predators in the Eocene that probably hunted the mammalian megafauna. I have posted a short Wiki article on the creature below.
Pristichampsus ("saw crocodile") is an extinct genus of crocodylian that grew to approximately three metres (10 ft) in length.
Pristichampsus was heavily armoured, with long limbs indicating a cursorial (i.e. running) lifestyle. Its toes had hoof-like unguls on them. Paleontologists hypothesise that it hunted terrestrial mammals. Pristichampsus's teeth were laterally compressed, sharp and had serrated edges. Due to their similarity to those of certain theropod dinosaurs they were initially mistaken for theropod teeth, leading paleontologists to believe that some dinosaurs survived the Cretaceous-Tertiary extinction event.[citation needed]
Several remains of Pristichampsus have been found around the world: P. rollinatii, the type species from the Lutetian of France; P. vorax from the Middle Eocene of Wyoming and West Texas; P. hengdongensis from the Paleocene of the Hengdon Basin in China, P. birjukovi and P. kuznetzovi from the Middle Eocene of Eastern Kazakhstan; P. geiseltalensis and P. magnifrons from the Lutetian of Germany.
[edit] Terristrial adaptations
The species, P. rollinatii displays the range of morphological adaptations to terrestrial carnivory made by this genus. [1] It had extensive armour (osteoderms), and would have been an unlike swimmer, while the tail was more reminiscint of a dinosaur's, being round in cross-section and lacking the osteoderm crest observed in extant species.[1]
It also had relativey long limbs with the hoof-like unguals, and was capable of galloping and facultative bipedalism.[1] However, this would only have been possible at high speeds as the centre of gravity moves in front of the pelvis.[1]