Breeding sedge wrens are territorially fickle too. In a given location they are often common one year and impossible to find the next.  However, because their presence or absence is less conspicuous, their erratic movements are seldom noticed.


Such wanderlust or, more technically, nomadic behavior or low site fidelity affects many species. Why this happens is a mystery mitigated only by speculation that species such as dickcissels wander when drought or other unfavorable conditions affect their core range.  Logical as this explanation seems, it doesn’t explain why other species similarly affected stay where they are.








                           

                                                 

                                           Puzzle: Why Are Dickcissels Prone to Wander?