الطيور

ما معنى دوران الغربان؟

Crows

الغربان هناك العديد من الأسباب التي تجعل أفراد عائلة الكورفيد ، التي تضم عدة أنواع من الغربان ، قد تشكل دوائر في الهواء. قد يكون من الصعب تمييز هذه الطيور السوداء الكبيرة عن بعضها البعض ، خاصةً من مسافة بعيدة. للتأكد مما قد يعنيه عندما ترى مثل هذا الطائر يدور حول منطقة معينة ، من المفيد أن تعرف بالضبط الأنواع التي تشاهدها.

الغربان

الولايات المتحدة لديها ثلاثة أنواع مختلفة من الغربان. الغراب الأمريكي ، الذي يغطي نطاقه معظم الولايات المتحدة وكندا ، هو الأكبر ، يليه غراب السمك ، الذي يوجد في الولايات على طول سواحل المحيط الأطلسي والخليج من نيو جيرسي إلى لويزيانا. أصغرها هو الغراب الشمالي الغربي ، الذي يلتصق بساحل المحيط الهادئ الشمالي. هناك أيضًا نوعان أصليان من الغراب: غراب تشيهواهوان ، الذي يوجد في جنوب غرب الولايات المتحدة والمكسيك ، والغربان الشائع ، الذي يغطي نطاقه معظم غرب الولايات المتحدة وكذلك بعض الولايات الشمالية الشرقية. يمكن العثور على هذه الأنواع أيضًا في جبال الأبلاش.

ركوب الحرارة الغربان

عادة ما تبقى بالقرب من قمم الأشجار وتطير لمسافات أقصر من الغربان ، التي يمكن رؤيتها غالبًا وهي تحلق على تيار صاعد من الهواء الدافئ يسمى “الحرارة”. عادة ما تحمل هذه الحرارة الطيور في نمط دائري. مثل الطيور الكبيرة الأخرى التي تركب الحرارة ، مثل الصقور والصقور ، تستفيد من هذه التحديثات لإراحة أجنحتها ومساعدتها على الطيران أعلى وأبعد مما كانت ستتمكن من تحمله تحت قوتها.

إقرأ أيضا:الخواضون: ما الذي يميز هذه العائلة من الطيور؟

المفترسات والفريسة

تُرى الغربان في بعض الأحيان وهي تدور عمداً حول مناطق أصغر بالقرب من رؤوس الأشجار. أحد أسباب ذلك هو أنهم ربما اكتشفوا طعامًا أو فريسة محتملة وهم في طريقهم للصيد. قد يقومون أيضًا باستكشاف المنطقة بحثًا عن الحيوانات المفترسة أو المنافسة قبل الهبوط لتناول الطعام. خلال موسم التعشيش ، عادة ما تلتصق الغربان مع الطيور الصغيرة في العش بالقرب من المنزل وتراقب بشدة الحيوانات المفترسة أو التهديدات المحتملة الأخرى.

الأدب والفلكلور

الغربان لها تاريخ طويل من الارتباطات المشؤومة ، التي يرجع تاريخها على الأقل إلى روما القديمة. غالبًا ما تم استخدامها في الأدب كنذر بالموت أو نذير شؤم. ربما يكون هذا بسبب ريشها الأسود ، أو لأنه من المعروف أنها تتغذى أحيانًا على جثث ميتة. في حين أنه من الصحيح في بعض الأحيان أن الغراب الذي يدور حول الجيف كان معروفًا تاريخيًا أنه يدور حول ساحات القتال والأماكن الأخرى التي مات فيها الناس ، إلا أن هناك أسبابًا أخرى قد تكون تدور حول الغراب. لا يوجد سبب لافتراض أن هذا السلوك هو نذير الموت أو سوء الحظ.

إقرأ أيضا:تدلي التنفيس في الطيور
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