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Today’s selections of no-frills documentaries in the “Japan Wildlife Festival” only scrape the surface of the diversity in Southeast Asian wildlife. However, some sympathetic real-life characters emerge, endangered by the region’s hypercharged development. The stars are low-key but exotic: the reclusive Dictyophoria indusiata and the luminescent Lampteromycess japonious in The Fascinating World of Mushrooms; in the wild Nikko Char: The Guardian of the Water Fish, a Japanese mountain stream fish threatened by beech logging and sport fishing; and the many inhabitants of The Living Tideland, a densely populated 180-thousand-acre ecosystem in danger of being “reclaimed” as dry land in southwest Korea. See the giant nereid worm, the bubble snail, and the ocypodid “sculpting” crab before they hit it big. From 1-5:30 p.m. at the Museum of Natural History’s Baird Auditorium, 10th & Constitution Ave. NW. Free. (202) 357-2700. (John Dugan)