the hawk's/egal's eat them and take them away.
They decrease the already threatened population numbers of ground based and flightless native birds.
Yes, but they need to be kept dry and if the ground has had numbers of birds on it before (even years before), you may well have disease problems, such as intestinal worms and coccidiosis (amongst others).
Kiwis have only tiny, rudimentary wings. They are completely ground-dwelling.
Some birds that build their nests on the ground are flightless birds, such as emus and ostriches, but other birds which can fly are also ground-nesting. These birds include chickens, penguins, killdeer (a kind of plover), and water birds such as ducks, geese, swans etc.
It depends what birds you are talking about. There are millions of birds.
The ostrich and emu, both flightless birds. :-)
yes
It is surely unfortunate for you and for the birds if they are in the habit of not stopping before colliding with you. Apart from that luck has very little meaning.
Blue tits
no not all birds
Yes ... they are one of two species of ground-dwelling Australian birds.
Certain types of birds do lay eggs on the ground.