====== Birds recognition ======
{{tag>rules expert_systems}}
===== Description =====
Expert system which recognize birds

**Source**:  Building Expert Systems in PROLOG Publisher
===== Download =====
Program source code: {{birds_recognition.pl}}
===== Listing =====
<code prolog>
order(tubenose) :-
nostrils(external_tubular),
live(at_sea),
bill(hooked).

order(waterfowl) :-
feet(webbed),
bill(flat).

family(albatross) :-
order(tubenose),
size(large),
wings(long_narrow).

family(swan) :-
order(waterfowl),
neck(long),
color(white),
flight(ponderous).
</code>
===== Comments =====