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I adopted  these 2 cats in the last few years,    I have had the
little female for 18 months,  And the Tomcat for about 2  and a half
years.  Neither used to bring prey home, and I was not aware
previously  of  any hunting.   But suddenly, this last 2 months.  They
frequently bring home either dead, or mutilated and struggling birds.
They have access to the outside only  in daytime.    They are both
neutered.   I dont scold them, as its  clear to me scolding the cat
only works if you catch them in the act and they associate the
scolding

Questions.

1.  What can I do with struggling half dead  suffering prey  ?   My
instrint is to learnn how to finish off such a bird.  I have
previously taken birds to wildlife sanctuaries and it all ends with
the bird not making it.  internal injuries etc.

2.  PREVENTION.   short of making the 2 into indoor cats,  what about
collars with bells.  I purchased  2  non flea collars that have a
little bell,   There is a plastic  stud fastener that is supposed to
quick release if the collar gets snagged.  But It takes some force to
open it, and I think if the cats foot became trapped in it  there
would be a problem.  Eqaully,. if the smaller (female)  cat got caught
somewhere,  she might not have enough weight and power to fporce the
fasterner open.    Also, I am concerned about any dermotogical
problems  that enclosing the cats fur over the neck  might promote.

Can  anyone recommend a  solution to my above problems   ?    Suggest
any products  ?     I am in the UK

Many thanks :)