Depends on the bird. Small birds, particulary hummingbirds, can have very fast metabolisms, and will starve within hours if they're not finding food. Some even have to go into something more like hibernation than sleep in order to make it through the night.
Others, like penguins, can easily go weeks without eating and still remain healthy.
not very long.....
how long will it take a skunk to die of starvation in a trap
about six to eight weeks
It takes about a month of not eating to starve to death.
1 hour
It depends on which type of bird.
I believe there is no bird that feeds its babies its blood. The bird and its younglings would starve to death.
A mouse requires about 2 to 3 grams of food per day in order to survive. The mouse will starve in just a few days without that amount of food.
5 hours
2 weeks
3 weeks?
It takes about one day.