Breeds

A breed is a programmer-defined subtype of the turtle type.

For example, here's how we define new breeds:

breed [cats cat]
breed [dogs dog]

Breeds can have their own attributes in addition to the inherited turtle attributes:

dogs-own [bark bite]
cats-own [meow scratrch]

NetLogo automatically defines breed-specific variants of most of the built-in procedures.

For example, there are breed-specific variants of create, hatch, and sprout:

to init-model
ca
create-cats 50
[
set color red
]
create-dogs 50
[
set color blue
]
ask turtles
[
setxy random-xcor random-ycor
]
end

There are breed-specific sets:

to update-model
ask dogs
[
let a-cat one-of cats in-radius 5
if a-cat != nobody
[
chase a-cat
]
]
ask cats
[
rt random 360
fd 1
]
end

See the section on breeds in the Programmer's Manual for more information.