If you have a birdhouse in your yard, you could spend days sitting around with binoculars waiting to see what cool little inhabitants come by. Or you can take Instructables user Sebelectronique's lead and build a Raspberry Pi-powered camera inside a birdhouse.
All you'll need here are a Raspberry Pi, the camera board, a Wi-Fi dongle, SD card, and a variety of other sensors, transistors, and resistors alongside some wood for the case. When you're done, you'll have a setup to monitor any birds who take up residence. Of course, if birds aren't your thing, you can use this to monitor just about any other animals who might be hanging out in your yard. Head over to Instructables for the full guide.
Raspberry with cam in birdhouse [Instructables]