Conversation so far:
what part of the chicken is the keel
A keel in bird anatomy is an extension of the sternum which runs axially along the midline of the sternum and extends outward, perpendicular to the plane of the ribs.
what purpose does the keel serve in a bird
The keel provides an anchor to which a bird's wing muscles attach, thereby providing adequate leverage for flight.
is the keel different in flightless birds
Two key differences between flying and flightless birds are the smaller wing bones of flightless birds and the absent or greatly reduced keel on their breastbone
which country has the most species of flightless birds
New Zealand has more species of flightless birds than any other country

Question: why
Self-contained rewrite: why does new zealand have the most species of flightless birds