In this paper, we propose a model of biological differentiation based on
physical features and behavioral strategies in order to probe the
mysteries of biological differentiation.
We, then, implement the model, and perform the Alife simulations of birds'
evolution in an artificial ecology.
The ecology
consists of two islands, and the
atmospheric temperature in each of the islands fluctuates
periodically.
As a result of the simulations,
we have observed that birds, adapting themselves to a change of
temperature in their habitat, branch off in two types of biology:
migratory bird and resident bird.