Flightless birds, nocturnal and diurnal raptors, and specialized bird beaks are important topics related to the question.
Flightless birds are birds that are unable to fly due to various evolutionary adaptations; examples include ostriches, emus, and penguins.
Nocturnal raptors, like owls, are active at night, while diurnal raptors, such as eagles and hawks, are active during the day. Nocturnal raptors have unique adaptations for hunting in low light conditions.
Bird beaks have specialized shapes for particular diets and behaviors, such as the long, slender beak of nectarivores for sipping nectar, and the short, sturdy beak of granivores for crushing tough grains.
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