Wildlife of
Hong Kong

Primary Threats

• Strong, sustained demand for housing and commercial space drives reclamation proposals, redevelopment pressure, and conversion of lowland habitats in the New Territories. While uplands are largely protected as Country Parks, the most biodiverse and irreplaceable lowland mosaics (fishponds, marshes, reedbeds, agricultural fallows, and village-edge habitats) face incremental loss and fragmentation from rezoning, brownfield logistics yards, and peripheral urban expansion.
• Net loss and degradation are concentrated in lowlands and along the coast: wetland/fishpond conversion, stream channelization, hillslope works, and coastal modification. Habitat fragmentation from roads/rail and scattered development isolates populations and reduces connectivity between Country Parks, wetlands, and coastal habitats.
• Major transport and land formation projects (new roads, rail links, bridges/tunnels, and associated works areas) can directly remove habitat and create barriers for wildlife movement. Construction disturbance, night lighting, and hydrological changes are especially relevant near wetlands (e.g., Deep Bay) and along coastal/marine corridors.
• Coastal and marine waters are pressured by sewage overflows during heavy rainfall, stormwater runoff from dense urban areas, and legacy contamination in sediments. Nutrient and chemical inputs contribute to algal blooms and degraded water quality in semi-enclosed bays and typhoon shelters, affecting corals, seagrass-associated fauna, and fisheries productivity.
• Hong Kong's inshore waters are heavily fished, including by small-scale and recreational sectors; historical trawling and continued high effort have reduced biomass and altered community structure. Declines in larger predatory fish and reef-associated species are linked to habitat impacts and fishing pressure, with knock-on effects for marine food webs.
• As a major transport and trading hub, Hong Kong has long been exposed to illegal wildlife trade risks (e.g., reptiles, ivory historically, and other high-value wildlife products). Even with strengthened laws and enforcement, demand and transit dynamics create ongoing pressure on globally threatened species and require continual interdiction and deterrence.
• Ornamental releases and accidental introductions in a subtropical, highly connected port city support invasive plants and animals that outcompete natives. In freshwater systems and wetlands, non-native fish/turtles and invasive plants can alter habitat structure and food webs; in urban-edge areas, invasives can dominate disturbed ground and reduce native regeneration.
• Sea-level rise and stronger storm surges increase flooding and erosion risks for low-lying coastal wetlands (notably Inner Deep Bay) and reclaimed shorelines. More frequent extreme rainfall events can trigger landslides, degrade stream habitats through sediment pulses, and increase sewage/stormwater overflow events that affect coastal water quality.
• High recreational use of Country Parks (hiking, trail running, cycling, barbeque sites) leads to trail erosion, litter, noise, and wildlife disturbance, especially in easily accessible peri-urban park edges. Light pollution from extensive nighttime illumination affects nocturnal species and migratory birds, and boating activity can disturb marine mammals and seabirds.
• Engineering of rivers and drainage channels for flood control and development has simplified stream morphology and disconnected floodplains. Coastal armoring, seawalls, and reclamation alter tidal flows and sediment dynamics, reducing intertidal habitat quality and resilience.