Narrative Lead

"A frog the size of a bowling ball, with heavy armor and teeth, lived among dinosaurs millions of years ago - intimidating enough that scientists who unearthed its fossils dubbed the beast Beelzebufo, or Devil Toad"

The writer here used a narrative lead, because the best way to catch the reader's attention is by describing the frog and how it is referred to as a "Devil Toad". No one really cares if new fossils are found, because all different types of fossils are found each day, as well as new discoveries. Using a narrative lead gives the story more interest. 

Nut graf: (second paragraph)

" Researchers discovered the creature's bones in Madagascar, yet it seems to be a close relative of normal-size frogs that today live half a world away in South America, challenging assumptions about ancient geography."

http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2008/02/19/MN20V4M3R.DTL&type=science