Why can’t ostriches fly?

ostrich are flightless birds, they can’t fly as the muscles of its wings are not able to support its weight

i.e. the ostrich is too heavy to fly. ostriches weigh around 100-160 kg and their body has evolved in such a way over the years that it is not suitable for flying
Genetic studies have also shown that ostriches lost their ability to fly due to dwelling on land, after the extinction of dinosaurs there were vast untapped resources on ground and bird like ostrich started spending more and more time on land and eventually lost their flying powers

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