Reaction of wild Hooded Crows to conspecific mummified in particolar postures and exposedin the field.A method for preparing bird specimens to be used as stimulus-objects in the field was tested bymeasuring the respon...Reaction of wild Hooded Crows to conspecific mummified in particolar postures and exposedin the field.A method for preparing bird specimens to be used as stimulus-objects in the field was tested bymeasuring the response of wild Hooded Crows,Corvus corone cornix.In a first series of experiments,HoodedCrows specimens were tested for general responsiveness and posture discrimination by conspecific.Moreapproaches were consistently made to Bristle-head posture than to Sleeked posture.In a combination of bristle-head specimens of different subspecies and species,C.c.corone was approached more times than C.c.cornix,whereas C.frugilegus elicited intermediate interest.In a different combination of bristle-head specimens,C.c.corone was more attractive than C.c.cornix,whereas a hybrid C.c.corone x cornix was less attractive than eachpure form.The approaches were usually aggressive.Bristle-head posture was confirmed to be a self advertisingposture and the comparisons between subspecies provided suggestions about the mechanism againsthybridation.展开更多
Centre for Learning&Performance Technologies(C4LPT)即"学习与绩效技术中心"是由英国Jane Hart女士创建的。该网站提供关于最新教育趋势、教育方法和教育工具的建议,现已成为全球浏览量最大的学习网站之一。截至2013年...Centre for Learning&Performance Technologies(C4LPT)即"学习与绩效技术中心"是由英国Jane Hart女士创建的。该网站提供关于最新教育趋势、教育方法和教育工具的建议,现已成为全球浏览量最大的学习网站之一。截至2013年,已有约两百万访客来访,浏览量达七百万次。展开更多
文摘Reaction of wild Hooded Crows to conspecific mummified in particolar postures and exposedin the field.A method for preparing bird specimens to be used as stimulus-objects in the field was tested bymeasuring the response of wild Hooded Crows,Corvus corone cornix.In a first series of experiments,HoodedCrows specimens were tested for general responsiveness and posture discrimination by conspecific.Moreapproaches were consistently made to Bristle-head posture than to Sleeked posture.In a combination of bristle-head specimens of different subspecies and species,C.c.corone was approached more times than C.c.cornix,whereas C.frugilegus elicited intermediate interest.In a different combination of bristle-head specimens,C.c.corone was more attractive than C.c.cornix,whereas a hybrid C.c.corone x cornix was less attractive than eachpure form.The approaches were usually aggressive.Bristle-head posture was confirmed to be a self advertisingposture and the comparisons between subspecies provided suggestions about the mechanism againsthybridation.
文摘Centre for Learning&Performance Technologies(C4LPT)即"学习与绩效技术中心"是由英国Jane Hart女士创建的。该网站提供关于最新教育趋势、教育方法和教育工具的建议,现已成为全球浏览量最大的学习网站之一。截至2013年,已有约两百万访客来访,浏览量达七百万次。
