These fish spend three-quarters of their lives on land, walking and climbing with fins.

Nature · Published 3 October 2026 Swipe more like this →

In short: Mudskippers are small, amphibious gobies that defy the aquatic norm. Found across the Indo-Pacific, these remarkable creatures have evolved to thrive in swamps and estuaries. Instead of hiding when the tide retreats, they emerge to walk, skip, and even climb trees using specialized, limb-like pectoral fins.

Mudskippers belong to the family Gobiidae and are native to tropical regions stretching from Africa to Australia and Polynesia. They are iconic inhabitants of mangrove forests and tidal mudflats, environments where they have developed extraordinary physiological adaptations to survive outside the water. While most fish rely on gills that fail in air, mudskippers retain water in enlarged gill chambers and utilize cutaneous respiration, absorbing oxygen through their skin and mouth linings. This requires them to remain in humid, moist environments, as their skin must stay wet to facilitate gas exchange.

Their movement is equally specialized. Unlike typical fish, mudskippers possess jointed pectoral fins that function similarly to limbs, allowing them to crawl across mud or scale low-hanging branches. To traverse the mudflats, they use these fins to move in a series of skips, a behavior that gives them their common name. Some species, such as the giant mudskipper, Periophthalmodon schlosseri, are found in marine, brackish, and fresh waters, frequently emerging from their burrows on sunny days to patrol their territory.

The ecological setting of these fish is deeply tied to mangroves, which serve as vital buffers for coastal ecosystems. These trees trap sediments and filter pollutants, creating the stable, muddy habitats where mudskippers thrive. However, these coastal zones are increasingly threatened by human development. As mangrove populations decline, the specialized niches required by mudskippers and other keystone species are put at risk, highlighting the fragility of the tropical estuaries that support such unique evolutionary experiments.

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