Why did the crocodiles outlive the dinosaurs?

Some research has questioned the claim of global wildfire. While the immediate effects of the impact--falling hot rocks, tsunamis, earthquakes etc--were serious, the main problem at the end of the Cretaceous was energy depletion. It was not necessary to burrow to survive, nor did water necessarily confer safety. Shorebirds could hardly rely on water, since there were enormous tsunamis, as well as falling debris. (Incidentally, enantiornithines like all birds, were not ectotherms and, as research shows, were in decline for a few million years before the end.) Shorebirds show that even those exposed to the full fury of the immediate effects could live--PROVIDED they could endure the subsequent energy depletion caused by less photosynthesis. The real key to survival was to be able to get by with less food. As ectothermic or cold blooded creatures, crocodilians required only a small fraction of the energy needed by dinosaurs of comparable size, let along bigger. It is NOT true that most crocodilians died out. Dyrosaurs, and the ancestors of modern crocs and alligators survived. As for shorebirds, despite being endothermic, they were at least small, and could range far and wide for food. Moreover, they aren't very fussy--look at seagulls at a garbage dump. :)