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Amami Guntō NP, Kagoshima
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Kinsakubaru’s towering ferns and subtropical forest appeared in the 1994 film Godzilla vs. SpaceGodzilla. The monster’s cinematic jungle is a real, living forest on Amami Oshima.
A local guide recalls an old berry-gathering trick: roll a tsuwabuki leaf into a little pouch and stitch it with a fern stem. Kinsakubaru’s forest supplied both snack and basket; collecting plants here today is prohibited.
At the trail’s turnaround, an Okinawa white oak spreads dramatic plank-like buttress roots. A local guide estimates this individual is over 150 years old, about 22m tall, with a trunk around 1m across.
The towering “tree” is actually a fern. New fronds unfurl from tight fiddlehead curls, and fallen fronds leave oval scars around its trunk; one local guide estimates it can reach about 10m in 20 years.
Lidth’s jay flashes deep blue and red, then gives a harsh, crow-like cry—the surprise is that this striking Amami bird really is a crow relative. Its calls are among the sounds visitors may hear in the forest.
Look up in July: the yellow-flowered sagari orchid hangs from tree branches in Kinsakubaru. Japan’s Environment Ministry says it is found only on Amami Oshima within Japan—a remarkably small range for a canopy plant.
Bird’s-nest ferns cling high on Kinsakubaru’s trunks, but they aren’t parasites: they collect rainwater and make their own food, using the tree only as a perch. Botanists call this epiphytic growth.
On one rainy-morning tour, a guide heard the endemic Ootora thrush calling while thick clouds kept Kinsakubaru unusually dim. The guide suggested the dawn-like light may have prompted its singing.
Researchers counted 2,928 tree trunks with girths of at least 15cm in a single 1-hectare Kinsakubaru plot. Even within that hectare, counts ranged from 12 to 55 trunks in each 10-by-10m square.
Scientists placed 10 nest boxes for Lidth’s jays at Kinsakubaru; only 1–2 were used each year. At a younger forest site, 7–10 were occupied, leading researchers to suggest the mature forest already offered good natural nest sites.
Shii acorns were feast-or-famine: 5 years of Kinsakubaru monitoring found bumper crops in 2003 and 2007 but poor ones in 2004–05. After poor crop years, jay nesting activity ran more than a month late.
The trail visitors walk was once used by islanders to haul timber, and researchers found traces of a charcoal kiln in the forest. In 1975, 125ha of Kinsakubaru were designated a nature-observation forest.
