This topic can be researched easily by checking materials
provided ( for 10 years) by Americsn Bird Conservancy.
They also have materials suitable for classrooms etc. Their
program is called "Cats Indoors!". They provide plenty of
scientific info if you want their perspective and some options
for action.
http://www.abcbirds.org/cats/
Judy Meredith
jmeredit at bendnet.com