Human Intervention at Tumbi Wetlands Bushcare 
How can we help fauna shelter?
Shelter for native fauna can be many things:

it may be planting dense shrubbery where small birds can hide from predators, or...

even nest boxes, in an area lacking old trees, for microbats and birds not able find hollow logs. You can get help from Habitat for Wildlife.
Shelter for birds can be dense vegetation, or even special nest boxes.
Many areas are lacking in old trees with hollows for nesting. Nest boxes are an good alternative for some native fauna.