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Normally if you find a young bird, you should contact a local wildlife rehabilitator. Starlings, as well as house sparrows, are exceptions to this rule. These birds are considered invasive, or non-native, species, and do not fall under the same rules as native birds. Most wildlife rehabilitators probably would decline to care for a fledgling starling, because it is considered an invasive species. This also means that anyone can care for an abandoned starling without breaking any laws.