Brown trout has a fusiform (or spindle-like) body shape. It is silver to olive-brown and yellow in colour, with small scales and large red spots covering the body. In South African dams, this species can grow up to 75cm in length and weigh over 6kg, whereas in rivers, smaller specimens are found. This fish feeds on invertebrates, insect larvae, aerial insects and molluscs, as well as the occasional fish and frog.
A medium-sized chocolate-brown bird, with a yellow beak, eye patch, feet and legs. The head, throat and tail are black, with the tail having white tips and white undertail feathers. The large white patches in the wings are noticeably visible when the bird is in flight. Native to India, central and southern Asia. These birds compete for the same resources as indigenous species.
A medium-sized wasp with a body length of 12-16mm. It is boldly patterned with black and yellow and almost identical to the German wasp – also invasive in the Western Cape. It has yellow and black bars on the abdomen and constructs communal paper nests in trees, shrubs and under roof eaves.
A medium-sized wasp with a body length of 12-17mm. It has a black and yellow body pattern and looks very similar to the European paper wasp (Polistes dominulus). The antennae are black. These are social wasps and they construct paper-like nests in trees, roof eaves, under rock overhangs and sometimes in underground burrows.