What does "run-in" mean?
A "run-in" is a disagreement, argument, or fight. Usually, it is used to signify that someone has gotten into trouble in some way. The speaker uses "run-in" here likely to mean that the baby echidna had a physical fight with some birds and had gotten injured as a result. Ex: The criminal had a run-in with the cops. Ex: My dog had another run-in with some stray cats.
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