The baby bird 2

Then, she called named the baby bird "Pio" to the baby bird and fed it with great love and care.
In its early days (In the beginning/At first...), Pio ate bread dipped in milk along with very small pieces of meat too. He and slept in a shoes box (what size shoe I wonder?).
As days went by (As the days passed...), Pio was growing. and He often left his box to jump/hop all over/all around our living room.
Little by little, he was began learning to fly. He used to perch on the top of the backrest of a chair.
After a couple of months, Pio was old enough old to be released. Nevertheless, we realized that it was so too easy to catch him, and  it would be easy for him to be hunted by a cat/to fall prey to a cat!.
(For this reason and...I believe this former phrase is understood and I think you can do without it) After extensive family deliberation we decided to keep him.
In conclusion, after five years we have a bird that apparently couldn't live in captivity (In the end, five years have passed and will still have  bird that apparently couldn't live in captivity).

That is a lovely little story Daniel, and very nicely written.  The final sentence has a little bit of a nuance to the wording and it makes it a bit dificult to know exactly what you want to say there.  The way it is written implies that the bird at one timed appeared as though it would not or could not live in captivity.  Time has passed and we all see that it has thrived.

The baby bird 2

Then she called Pio to named the baby bird Pio and fed it with great love and care.
In its early days, Pio ate bread dipped in milk, very small pieces of meat, too and slept in a shoe box.
As days went by, Pio was growing grew and he often left its his box to jump all over our living room.
Little by little, he was learning started to learn how to fly and used to perch on the top of the backrest of a chair.
After a couple of months, Pio was enough old old enough to be released. Nevertheless, we realized that it was so too easy to catch him, so it would be easier to be hunted and that he was too prone to being eaten by a cat.
For this reason, and after extensive family deliberation, we decided to keep him.
In conclusion, after five years, we have a bird that apparently supposedly couldn't can't live in captivity.

Great job, and such a cute story :-)