I grew some vegetables in my backyard. These kales grew well until birds started attacking them as well as stray chicken from my neighbour's compound. These birds would perforate the leaves to the extent that it was not worth harvesting them for human consumption. How do you protect your vegetables from birds?
Out here in the countryside, our fledgling little garden is under constant threat from birds (especially ravens), as well rabbits, gophers and various other rodents. (I guess I should be grateful that the coyotes and mountain lions aren't interested in tomatoes.)
Here, there is no way I could plant a garden in the ground and leave it unprotected, so our seedlings are currently inside a box built from pre-sawn, modular pine boards which are fitted together by slipping the ends into pre-cut corner supports. The box currently measures four feet by four feet square and about three feet high, but, thanks to the modular design, I will be able to increase the width and/or height of the box as needed, fairly easily.
To thwart the critters, I have covered the top of this box with overlapping layers of chicken wire. That takes care of the birds (while still allowing access to beneficial insects), but I'm still concerned about gophers and field mice. So, I am taking other measures which seem to help -- such as spreading human hair and even cat hair in and around the plants.
If you don't want to go this route, I'll endorse CrazyConure's suggestion above: Hang CDs (compact discs or DVDs) from the trees or fencing all around your garden. My nearest neighbor (who has great success with his garden every year) swears by this method to keep the birds away. My neighbor also ties lengths of reflective tape to the trees, with one end of each length left to flap in the breeze. (Our first year here, I couldn't figure out what the rustling noise was from a few acres away!)
One thing some folks swear by (although I have never tried it) is a motion-activated scarecrow. That seems a bit extreme for a small garden, but if I were desperate, I would consider it. (There are also motion-activated sprinklers, but I think those are aimed primarily at deterring cats.)