How to apply tostring() to a list output in java

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Java

Hello everyone, I have a class of Animals, a AnimalGroup class and a Main class. The AnimalGroup class is instantiated and it has a list of Animals. I have a print method in the AnimalGroup class that prints a list of animals but it's printing the memory address of the content of the list so I want to write a toString method in the AnimalGroup class that would print the content of the animal list.
Animal class

public class Animals {
	
	String name;
	String classification;

	
	public Animals(String name, String classification) {
		this.name = name;
		this.classification = classification;
	}
	
	//Getters and Setters
}

AnimalGroup class

public class AnimalGroup {
	
	String name;

	public AnimalGroup(String name) {
		this.name = name;
	}

	//Getters and Setters

	public void printAnimalsList(List<Animals> animals) {
		for(Animals i : animals) {
			System.out.println(i);			
		}
		
		public Animals toString() {
			
		}
	}

I need to complete the toString method, thanks for any help.

What I have tried:

public class Main {

	public static void main(String[] args) {
		
		Animals lion = new Animals("Lion", "Mammal");
		Animals tiger = new Animals("Tiger", "Mammal");
		Animals snake = new Animals("Snake", "Reptile");
		
		List<Animals> animalsList = new ArrayList<>();
		animalsList.add(lion);
		animalsList.add(tiger);
		animalsList.add(snake);
		
		
		AnimalGroup animalGroup1 = new AnimalGroup("Group1");
		List<List<Animals>> animalsGroupList = new ArrayList<>();
		animalsGroupList.add(animalsList);
		animalGroup1.printAnimalsList(animalsList);

	}

}