Which is NOT an example of altruistic behavior?

Question by BigZ: Which is NOT an example of altruistic behavior?
A ground squirrel giving an alarm call when a predator is near.
Female workers within a honey bee hive are sterile.
Infanticide in Hanuman langur.
Nonreproductive male and female naked mole rats who forage for food.
A young bird remaining at the nest and helps the parents raise additional offspring.

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