40 Fun Facts About Mangroves

Mangrove fishermen in the Ganges delta wear masks on the backs of their heads to fool which predator?

Tiger attacks tend to come from behind, so a face on the back of the head was meant to make the cat think it had been seen. The trick worked only briefly before the animals caught on.

Which video game added a mangrove swamp biome, alongside the Deep Dark, in The Wild Update?

Minecraft released The Wild Update in June 2022, and its mangrove swamps arrived with a new type of wood, mud blocks and boats with chests.

Which fish of Indo-Pacific mangroves uses its front fins to move across land and climb low branches?

Mudskipper species can take in air through the lining of the mouth and throat, which lets them feed, fight and court on land for long spells.

Which fish found in Asian mangroves knocks insects off overhanging branches by spitting jets of water?

Archerfish can hit prey up to three metres above the surface, correcting their aim for the way light bends between water and air.

Which animal has a pygmy species found only on one small Panamanian island, where it lives among red mangroves?

Sloth numbers on Isla Escudo de Veraguas are tiny: the pygmy three-toed species, named by science only in 2001, is critically endangered.

Which primate of Borneo's mangrove forests can swim up to 20 metres underwater?

Proboscis monkeys are perhaps the most aquatic of all primates, with partly webbed toes, and the male's huge nose hangs lower than his mouth.

Which continent reported no mangrove forest at all in the UN's 2025 global forest assessment?

Europe has none, while Asia holds more mangrove forest than any other region and just five countries share almost half of the world total.

What do red mangrove seeds do while still attached to the parent tree, unlike those of most plants?

They sprout into seedlings called propagules, which then drop into the water and can drift for up to a year before taking root in mud.

Which seafood, raised in coastal ponds, is a leading cause of mangrove destruction worldwide?

Shrimp ponds dug along tropical coasts replace the trees outright, and the closed-pond kind does the most damage of all.

Sap from the milky mangrove left some of Captain Cook's woodcutters without which sense for a time?

Sight goes when the tree's toxic latex touches the eyes, which is why it is also known as the blind-your-eye mangrove.

Which mangrove forest, the largest on Earth, spreads across the border between India and Bangladesh?

The Sundarbans covers roughly 10,000 square kilometres of the Ganges delta, and its name most likely comes from the sundari, a mangrove tree abundant there.

Which country holds the world's largest area of mangrove forest, well ahead of second-placed Brazil?

Indonesia has about 3.4 million hectares, roughly a fifth of the global total, and its islands also hold the greatest variety of mangrove species.

Which US national park contains the largest mangrove ecosystem in the Western Hemisphere?

Everglades National Park has red, black and white mangroves, and is also North America's most significant breeding ground for tropical wading birds.

Which crustacean of mangrove mudflats has males with one claw far larger than the other?

Fiddler crab males raise and drop the big claw in a beckoning wave to win over females, who judge both its size and the quality of the display.

Which animal, the largest living reptile, lurks in mangrove swamps from India to the Solomon Islands?

The saltwater crocodile is the biggest reptile alive, and in mangroves it often preys on the large mud crabs that live there.

Which national bird of Trinidad and Tobago flies in at dusk to roost in the mangroves of Caroni Swamp?

The scarlet ibis gets its red feathers from pigments in the crustaceans it eats, and young birds stay grey, brown and white until that diet colours them.

Night boat tours on mangrove rivers in Malaysia and Thailand take visitors to see which insects?

Fireflies of the genus Pteroptyx gather on favoured trees and flash in unison to attract mates, and their larvae need the constantly damp ground of the mangroves.

What do the upright roots that black mangroves poke out of the mud like straws help the tree take in?

Oxygen is scarce in waterlogged mud, so the roots work as breathing tubes; they typically stand up to 30 cm tall, but in some species they top three metres.

Which kind of weather kills mangroves and limits how far north they spread along Florida's coasts?

Frost keeps most of them to the warm south, though black mangroves can regrow from their roots after a freeze and so range farthest north.

In which US state is the red mangrove treated as an invasive species rather than a native tree?

Hawaii has dense thickets made up of red mangrove alone, while in Florida, Louisiana and Texas the same tree is a valued part of the coast.

Which colour names the carbon captured and stored by mangroves, seagrass meadows and tidal marshes?

Blue carbon is locked away by coastal and ocean plant life, and mangrove forests alone take in about 24 million tonnes of carbon a year.

Which sea creature lies on the floor of mangrove lagoons so algae in its tissues can catch sunlight?

The upside-down jellyfish, Cassiopea, rarely swims and spends most of its life with its bell on the bottom and its frilly arms pointing up.

Which shellfish settles on the roots of red mangroves around the Caribbean and is fished for food?

Oysters of the mangrove cupped species are now mostly farmed, on platforms made of mangrove branches hung from racks between the tides.

The critically endangered mangrove finch survives in just two patches of forest in which island group?

The Galápagos Islands hold every one of them: the bird is one of Darwin's finches, with an estimated 20 to 40 adults in 2021, all on Isabela.

The nipa, Nypa fruticans, is the only member of which plant group adapted to life in mangrove swamps?

Palm fronds from the nipa are a traditional roofing thatch, and the plant actually prefers brackish estuaries to pure seawater.

The Malaysian town of Kuala Sepetang is famous for making what from sustainably farmed mangrove wood?

Charcoal is still fired there in traditional kilns, some of them open to visitors, beside the Matang Mangrove Forest Reserve.

Tannins from mangrove bark, like those from oak and chestnut, traditionally cure which material?

Leather can take its colour from the bark too: the mangrove Ceriops tagal yields red and black dyes used in tanning.

Where do mangrove forests store most of the carbon they take out of the air?

In the soil, along with buried dead roots: mangroves cover only 0.5 percent of the world's coastal area yet hold 10 to 15 percent of the carbon stored in coastal sediment.

Which insects help turn fallen mangrove wood into peat by using it to build their nests?

Termites process fallen leaves, roots and wood into peat for their nests, working alongside the fungi and bacteria that also break the forest's debris down.

Which UN agency proclaimed 26 July the International Day for the Conservation of the Mangrove Ecosystem?

UNESCO's General Conference created the day in 2015, and the agency also protects mangroves inside its World Heritage sites and biosphere reserves.

Which kind of amphibian has a crab-eating species that can survive in salty Asian mangrove swamps?

The crab-eating frog is possibly the only living marine amphibian: adults survive salinity as high as 2.8 percent, and its tadpoles cope with even more.

The mangrove rivulus, a killifish that can live for weeks on land, mostly breeds by which unusual method?

Self-fertilisation is its usual method, since most of the fish are hermaphrodites; on land it shelters inside fallen logs and breathes through its skin.

In which geological period, when flowering plants first flourished, did today's mangrove families begin to appear?

The Late Cretaceous is when they arose, and the slow drift of the continents later helped spread the plants around the world.

Mangroves belong to many unrelated plant families that gained similar traits through which process?

Convergent evolution gave about 16 separate plant families their own answers to salt, tides and airless mud, so mangroves are a way of life, not a family tree.

Which African country has the largest area of mangrove forest on the continent?

Nigeria has close to a million hectares of mangroves, and in its Niger Delta poorly regulated oil and farming are the leading causes of damage.

Which Central American country is the only home of the endangered mangrove hummingbird?

Costa Rica's Pacific coast is its entire range, where the bird lives in large stands of the tea mangrove and feeds mainly on nectar from mangrove flowers.

Where on a black mangrove do white crystals form as the tree pushes out the salt it has absorbed?

On its leaves, which often look whitish as a result, because the tree pushes the salt out at night and on cloudy days.

In some regions, fishermen carve the upright roots of the mangrove apple into what?

Net floats are shaped from its buoyant roots, which is why it is sometimes called the cork tree; the fruit looks much like a persimmon.

Which tree is often counted as Florida's fourth mangrove, growing farthest inland of the group?

Buttonwood is named for its button-like fruits and, unlike the red, black and white mangroves beside it, can grow on dry land.

The white flowers of Florida's black mangrove are the source of which food, sold under the tree's name?

Honey from black mangrove flowers is made by bees, which pollinate the tree; its neighbour the red mangrove relies on the wind instead.