id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
iguana-17917	Powell, Robert	Threatened Amphibians of the World	2008	2	.pdf	application/pdf	1305	43	44	Increasing evidence sug- gests that many species are already extinct and many others are on the verge, leading to a growing concern that amphibians are the canaries in the coal mine — indicators of problems that soon will affect other, momentarily more resilient forms of life, including us. Next comes the heart and soul of the volume, ten pages devoted to accounts of species known to have gone extinct in historical times, 464 pages to accounts of species threatened with extinction (“critically endangered,” “endangered,” or “vulnera- ble” in terms of IUCN Red List criteria), and another 36 pages to species considered to be “near threatened.”	cache/iguana-17917.pdf	txt/iguana-17917.txt