Krebs has discovered that great blue herons look up more often when in smaller flocks than when in larger ones, solely as a consequence of poor feeding conditions.
克雷布斯发现，大蓝鹭在较小的群体中比在较大的群体中更容易抬头，这完全是由于恶劣的饲养条件造成的。
Blue Herons along with Bald eagles can also be seen.
鱼鹰和蓝鹭一起白头鹰也可以看出。
Osprey and Blue Herons along with Bald eagles can also be seen.
鱼鹰和蓝鹭一起白头鹰也可以看出。
Osprey and Blue Herons along with Bald eagles can also be seen.
鱼鹰和蓝鹭一起白头鹰也可以看出。
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