public class Animal {

	private String species;
	private String sound;

	public Animal() {
		species = "unknown species";
		sound = "unknown sound";
		System.out.println("animal constructor (0 parameters)");
	}

	public Animal(String species, String sound) {
		this.species = species;
		this.sound = sound; 
		System.out.println("animal constructor (2 parameters)");
	}

	public void speak() {
		System.out.println("I am a " + species + " and I say " +sound);
	}

	public String toString() {
		String s = species + ":" + sound;
		return s;
	}
}