they were used as meat to eat.
all of them they help keep the useful ones alive in a food chain which is useful to us
birds are vry useful to us (eg) fire flies ,
Thermals are useful to birds because the hot air rises and the large wingspans of birds traps the rising air underneath causing them to rise and be able to glide.
Animals and birds are useful to us because they help us in many ways. Animals help us to survive by us killing and eating them, they developed the dog and cat for pets for us, and they are interesting to watch or learn about. Animals are a very unique and interesting type of living thing on the Earth.
NO
They eat worms
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Because it gives Shade, Shelter to birds and useful for different medicines.
Fuels are useful to us. It is useful to us because we use it for our cars
the tail of birds is really useful during their flight and hence is the 5th limb
they were used as meat to eat.
For humans, not particularly. But there are plenty of birds that eat them.