Robins have a nest of only 2 young. Parents were feeding
both young at first, then stopped feeding the one. Now there is only
one. Why do did they stop feeding it, as there were only two to care
Parent birds respond to the begging actions of their nestlings. Its
not possible to say for sure why they stopped feeding one while
continuing with the other, but it MIGHT be that one was weak, sick or
had some other problem that caused it to stop the begging behavior.
Often if one chick is exhibiting signs of sickness or weakness the
parents will put all their effort into the strong chick in order to
guarantee its' survival. If they were to continue to feed both, the
stronger chick would not get as strong. It is very typical for the
"runt" to have a very low survival rate in birds.
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Update: June 2012