Around 200 Australian bird and mammal species rely on tree hollows to breed or shelter, and hollows take decades to form naturally, so a nest box is a genuine, immediate stand-in. Free, detailed, species-specific plans are published by WIRES, Backyard Buddies, and Bunnings, everything from possum boxes to microbat boxes to parrot boxes, so you can build one at home for the cost of some plywood and a few hours. Local Landcare groups also run periodic community nest box building days, worth searching "Landcare" plus your area to see if one's coming up. Visit https://www.bunnings.com.au/diy-advice/outdoor-living/pets-wildlife/how-to-make-a-diy-bird-nesting-box

Australia has over 1,600 native bee species, most solitary rather than hive-dwelling, and many will happily move into a simple hotel made from drilled timber blocks, bamboo, or hollow plant stems. Aussie Bee's free, detailed step-by-step guide covers different designs for different bee types. A genuinely free alternative to the paid mosaic-craft workshops that have become more common, this one just needs an hour with a drill. Visit https://www.aussiebee.com.au/bee-hotel-aussie-bee-guide.html

A shallow dish, some rocks for smaller birds to perch on, and a spot with some tree cover nearby is genuinely all it takes. ABC's Gardening Australia has a free, straightforward video guide. Fill and clean it regularly and it becomes a small, reliable reason to look outside every day. Visit https://www.abc.net.au/gardening/how-to/build-a-bird-bath/12797880