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Many pet animals can recognize people and react differently. However, most wild animals avoid all humans. But did you know that some wild animals can tell people apart? Scientists have found that crows and wolves can remember humans and treat them differently based on past experiences!  
Crows have amazing memories. In an experiment, scientists wore masks while bothering some crows. Later, when they wore the same masks again, the crows recognized them and warned others! Crows also remember kind humans. If you feed a crow often, it might follow you and even bring small gifts like shiny objects! 

Wolves are also very clever. Scientists discovered that wolves can recognize human voices! In an experiment, wolves reacted quickly when they heard the voices of familiar people but ignored voices they didn’t know. This means wolves can tell who is friendly just by listening! In the wild, they avoid dangerous humans but may feel safe around those they trust.  
Animals are smarter than we think! Next time you see a crow or a wolf, remember—they might be watching and remembering you, too!