Semi-terrestrial

Semi-terrestrial describes an organism or a species that spends a significant portion of its life cycle both on land and in water, exhibiting adaptations suited for both environments. This can encompass foraging, breeding, or sheltering behaviors. These organisms demonstrate a transitional lifestyle, bridging the gap between fully aquatic and entirely terrestrial creatures. The degree of dependence on each environment varies significantly between different semi-terrestrial species and the term does not imply an equal distribution of time. These organisms' adaptations could include the ability to hold their breath, walk on land, or find food from both the water and land.

Semi-terrestrial meaning with examples

• The mudskipper, with its prominent eyes and pectoral fins modified for 'walking,' is a prime example of a semi-terrestrial fish. It forages for insects on mudflats during low tide and retreats into burrows in the mud as the tide rises, demonstrating its dual habitat preference, where they're capable of terrestrial movement.
• Many turtle species are semi-terrestrial, spending time basking on land to regulate body temperature and nesting, but returning to the water for foraging and shelter. Their shells provide protection on land while the streamlined design allows for aquatic maneuverability, showing dual adaptation.
• Certain species of frogs are semi-terrestrial; their tadpole stage is entirely aquatic, but adults often venture onto land for hunting and reproduction, though still requiring moist environments. The frog's metamorphosis represents a distinct shift to a semi-terrestrial life.
• River otters exhibit semi-terrestrial behaviour, using dens on riverbanks but predominantly hunting in the water. Their webbed feet and dense fur help them excel both in water and on land, displaying adaptations that reflect a balanced lifestyle between the two environments.