alarm call 
noun
1A warning cry made by a bird or other animal when startled: the alarm call stimulates other nearby blackbirds to take evasive action...
- They'll give off an alarm call that other birds can hear for miles.
- As soon as the fruit began to ripen, a walk down the garden would be greeted by a Blackbird or Song Thrush alarm call as the birds inside the cage tried to get out.
- To exclude the possibility of a male calling in response to the other males' alarm calls rather than to potential predators, an alarm call was ignored if uttered within 10 s the call of the other male.
2A telephone call made by prior arrangement to wake the person called.I suppose there are other options such as television, or an telephone alarm call, or a timer on the hi-fi to play a CD....
- After an early alarm call and a four-hour journey to London, Cougars could have been forgiven if it had been their early play which was sluggish, but they hit the Skolars hard.
- I trot back to bed for two minutes' sleep and the next alarm call.