You can support wildlife by encouraging them to live in your backyard. Here's a rough overview on how to build a bat box. There are a ton of great websites that go into more detail if you're interested in building a box for your own backyard.
At least 2' (60.1cm) tall, and at least 14” (35.6cm) wide.
There can be multiple roosting chambers. Roosting chambers should be 1.9-2.5 cm apart.
Partitions and landing areas need to be roughened or covered in a durable plastic mesh (do not use metal, it will rush and break off).
Vents should be included if July temperatures surpass 30 C. Vents on the front should be 1.3cm wide and side vents should be 15cm tall and 1.3cm wide.
Plywood and cedar (do not use pressure treated wood).
Exterior paint: colour will depend on July temperatures. (27-30°C (80-85°F) black, 30-35°C (85-95°F) dark brown or gray, 35-38°C (95-100°F) medium or light colors, over 38°C (100°F) white).
Place the bat box in a location where the box will receive at least 6 hours of direct sun.
If possible, place box within one kilometre of water.
Mount on a pole or a building at least 10' off the ground.