Nineteen snowy plover chicks, a federally endangered bird, fledged from beaches in the Point Reyes National Seashore this season, the highest number in since 2007 and up from 15 last year. The fledged chicks may have been aided by a new policy of beach closures, in addition to other protective measures such as “exclosures,” or cages built around divots the birds dig in the sand to nest. The closures were established in part because the…