African rail
These birds probe with their bill in mud or shallow water, also picking up food by sight. They mainly eat insects, crabs and other small aquatic animals.
Stone loach
The larvae of stone loaches are benthic, they and small juveniles prefer sandy substrates with a slower current, as they grow they move on to gravel bottoms and faster currents. As adults they prey on relatively large benthic invertebrates such as gammarids, chironomids and other insect larvae. It normally feeds at nights when it uses the barbels around its mouth to detect its prey. They are tolerant of moderate organic pollution and stream canalization but they are highly sensitive to heavy metal pollution, chemical pollution and low oxygen levels which mean that the presence of stone loaches in a river is an indicator of good water quality. They are short-lived fish, normally living to age 3–4 years with 5 years being exceptional.