Mary Ann Thomas Monday, Sept. 30, 2019 3:28 p.m. | Monday, Sept. 30, 2019 3:28 p.m. The Pennsylvania Fish and Boat Commission confirmed Monday that an invasive species, the northern snakehead fish ...

Although whale sharks are the biggest fish in the sea, they're still threatened by ingesting small bits of plastic. Photograph by Thomas P. Peschak, Nat Geo Image Collection ...