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Should a person encounter a very young animal, he or she could leave an imprint. Baby animals attach, or imprint, on the first creatures they encounter after being born. However, Mr. Kranz says it’s more likely the animals crossing humanity’s path are far enough along on their development to avoid such confusion.

Still, it’s hard to resist reaching out to help a tiny creature.

“The easiest and hardest thing is to leave them alone,” he says.

Ms. Simon recommends visiting www.wildneighbors.org, a Web site of the Humane Society of the United States, for more information about young wildlife.