Mother hatches chicks and kills them.

[Barn yard chicks]

For many seasons, I've never seen this happened!
Mama laying on eggs and few chicks started hatching.
Oh, about a week goes by, she had 8 chicks and still a few more eggs to hatch.
This morning I went to check on her and one chick peeked to death while mama was trying to kill another.
I snatched all the chicks and put them in the chickies room.
Now why would mama do a thing like that. I've hatched hundreds of chicks naturally and incubation.

Smh

 

[sourland]

Sadly, it sometimes happens. I have known of dogs that killed their pups, and of course we know about aberrant behavior on the part of some people. I would not allow her to set again, and I would gradually remove her daughters from the flock.

 

[SilverBirds]

Some hens will sit on the eggs but are just terrible mothers. I wouldn't let her hatch and mother any more chicks. Remove all the chicks and put her back with the flock so she can't hurt anymore.

 

[Barn yard chicks]

Cochins breeds are the most gentle, broody, harmless birds.
I just don't understand.

 

[SilverBirds]

Cochins breeds are the most gentle, broody, harmless birds.
I just don't understand.

Oh, she's a Cochin? That is surprising. Some birds break the mold I guess

 

[LaFleche]

Mama laying on eggs and few chicks started hatching.
Oh, about a week goes by, she had 8 chicks and still a few more eggs to hatch.
This morning I went to check on her and one chick peeked to death while mama was trying to kill another.

This unnaturally prolonged hatch might be the reason for her behaviour.

Make sure to collect the eggs you want a broody to hatch and give them all at the same time under the broody, so they will hatch at the same time and not disturb her "natural clock".