Search

When you take the Search action, you make a Wisdom check to discern something that isn't obvious. The Search table suggests which skills are applicable when you take this action, depending on what you're trying to detect.
Search | | Skill
| Thing to Detect

| Insight
| Creature's state of mind

| Medicine
| Creature's ailment or cause of death

| Perception
| Concealed creature or object

| Survival
| Tracks or food