The seventh-grade class of 22 students spent their Wednesday lab period getting a hands-on look at life sciences through the daunting task of frog dissection. Before the classroom filled with the ...

The most transparent of the roughly 160 glass frog species, found from southern Mexico to the northern tip of Argentina, offer living anatomy lessons, revealing intestines, red beating hearts and ...

But analysis of its DNA, anatomy and geographic distribution told a different story. The frog represents the sole known species of a lineage dating back 57 million to 76 million years ago ...