sentences:  The larvae then proceed to burrow inside the frog and eat it from within (Pounds and Crump 1987).In recent decades, "A. varius" has become increasingly rare throughout its geographic range.The first incidence of its disappearance was recorded after a census conducted between 1990 and 1992 near Monteverde, Costa Rica revealed zero individuals where its population had previously peaked at 751 adults (Crump and Pounds 1985 and Pounds and Crump 1994).