I learned a bit from this site and i want to tell you that first you can keep sparrow eggs at 50 to 60'f untill you want to hatch them because keeping them at that tempeture will stop the growing of the baby bird untill you get it warm again. Next you have to keep the egg at 90'f to 100'f no higher no lower(an egg will take about 2-3 weeks to hatch but you might want to keep it to 4 or 5 in case). Next prepare a shoe box with a few paper towels that you can change if you need too ( make it comfy and free of any drafts to prevent respitory illnesses) .If the chick hatches( dont be sad if it doest because there is an 80 percent chance they wont hatch)feed it imediatly. First VERY gently tap on the bottom beak to let them know its feeding time and i have a recipie for baby bird food: 1/4 cup of lean ground beef 1 teaspoon cottage cheese 1/4 cup canned dog food 1/4 of a hard boiled egg yolk( you can cut the yolk into four pieces and use one of the four)1 teaspoon sand or fine dirt(most birds in the wild have a little dirt on there food so you have to get the baby used to it) 1 teaspoon dried turtle food next mix the igredients REALLY good so it is a little luiquidy and leave the food at room tempeture before feeding. when you are done feeding you might have some left so put that in the fridge.(remember the food HAS to be at room tempeture before you feed it.) after tapping on the beak they should open their mouth if not GENTLY force it open. Next take a Small amount of food( like a small pinch)and hand feed them or you can use VERY dull tweezers but hand feedings the best.The birds mouth will be gaping and the might be chirping for food so feed them.You can tell when your done feeding them when they do not have their mouth open anymore.Remember not to feed them ANYTHING but there food. you must feed the birds every 2 hours and maybe once in the night( they dont need much in the night because in the wild the mother bird would usally be sleeping but since these birds were born with out a mother bird they might be a little weak.)when they are about two weeks old you will want to chop bugs like grasshoppers and worms very good and put it in there food). once the birds are about 4-5 weeks oldfind a small room were there is nothing in it or a deck with a screen around it or just a pet bird cage.put the birds in (make sure its a least 70'f because the birds are still babys) and see if they want to try and fly try to do this every day. once the birds can fly well go buy a bird feeder and bird food and find a place where you see lots of Sparrows to teach the young birds that ,that is where you get food, from the bird feeder.
If you do all these things and try your best that 20'/. chance of that egg hatching might happen.
for one anyone who says that you should just let them die are quiters every thing is worth a try. and another i just got five sparrow eggs myself and need help with them too but like you i didnt have a choice either they died or i took them and they might have a chance at living. i understand the wildlife person that would make sence to bring them to someone but why not call and find out what you have to do and take care of them yourself unlike yours i'm not convinced mine are fertile.
Well.. if you love to be as thier mumy . so u have to keep those eggs worm . it dont remeber really the percent of the degree ..when they hatch you have to feed them the first week every "10-15" min daily.. From sunrise to sunset .. dont wake them up at night.. second weak u have to feed them every "20-30" min ..from sunrise to sunset... BTW.. every time u feed them u had to do a certain whistle by ur mouth to let them know u r comming "Food Time" after that they will consider u as thier mummy
Food type : portein meal worms (not earthworms) flies (not sprayed with insecticide) whole insects boiled egg (with powdered shell)