[alancalverd]

Not necessarily. There is a specification for ice ball strike, so a frozen chicken can (and certainly once used to be) a standard projectile. 

It's still a bit unrealistic as our Deecart has hinted, because chickens rarely fly high enough to get ingested even with the plane on the ground, individual small birds aren't much of a problem, and the real hazard at 500 mph and 5,000 ft is a flock of geese, several times heavier per capita than a rotisserie hen.  At the other end of the speed scale, there are a few accounts of eagles attacking gliders at 80 mph and up to 12,000 ft. Robins are very quick to build nests in the air intakes of piston aircraft, but chickens are not normally a hazard.

[SeanB]

By me the most common bird involved in bird strikes are vultures and seagulls.

[Deecart (OP)]

    natural chicken could not go over the barrier in the natural environment,

They really do get over barriers- because they fly.
This will remain true, regardless of your protestations.

I dident talk of the farmers barrier.
I mentionned the evolutionary barrier (you can read again to confirm).

What it means, is that if the "barrier" (evolutionary) is too high to go over in some single step, we need to wait for some silent evolution to break trought.
But perhaps human conducted evolution (like domestication) could help to step over ?

[alancalverd]

There is no evolutionary barrier to chickens flying. They all can, but most choose not to do so very far or very often.

[Bored chemist]

I mentionned the evolutionary barrier (you can read again to confirm).

So... you are bragging about mentioning something that doesn't exist.
Why would you do that?

Natural selection dont give them further abilities to fly.

Then what did the ability to fly?
Because they really can fly, no matter what you say.

[Bored chemist]

But perhaps human conducted evolution (like domestication) could help to step over ?

You do realise, don't you, that selective breeding will have chosen chickens that don't fly far.

[Deecart (OP)]

There is no evolutionary barrier to chickens flying. They all can, but most choose not to do so very far or very often.

Why Can’t Chickens Fly?

When it comes down to it, there are two simple reasons why chickens are terrible flyers. Their bodies are too large and heavy for their small wings to lift in the air. Humans selectively bred chickens for size and weight, prizing the heaviest, fastest-growing specimens; not the ones that could fly the highest or farthest. Because of this, modern domesticated chickens are large, heavy birds with wings that are too small and inadequate for long-distance flight.

https://petkeen.com/why-cant-chickens-fly/

It is like saying that every human can think like Einstein, but most choose not to do so very far or very often.

[Bored chemist]

It is like saying that every human can think like Einstein, but most choose not to do so very far or very often.

No, it's not.

[William Hardy]

Chicken can fly, but that depends on the definition of fly that you use. Because they can fly for a short while, but not long distances.