Final answer:
The passages provided do not explicitly discuss how to test if a baby bird is abandoned. Observation from a safe distance is recommended to see if parental birds are returning, before concluding that the bird is abandoned.
Step-by-step explanation:
The student's question about how to test whether a baby bird was abandoned does not have a direct mention in the given passages. However, the right course of action if one finds a baby bird that seems to be alone is not to immediately assume it's abandoned.
Often, the parent birds might be nearby and watching. It's best to observe from a distance for some time to see if the parent returns. If the baby bird is in immediate danger or has been observed for a while with no sign of the parents, then one could contact a local wildlife rehabilitation center for advice on how to proceed.