Why can't I read the newline characters of a text with an anonymous instance of Scanner(System.in)?

Question

before complaining about "repeated question" read the whole asking, this is different. It's not the same old question about why nextLine() after nextInt() doesn´t work.

I got this text on a file:

BEAR

PARROT

FROG

HORSE

When I copy the text on my clipboard I expect the nextLine() to read my clipboard line by line.

• When I try it with an anonymous Scanner object I got this.

        while (true) {
            String animal = new Scanner(System.in).nextLine(); //I copy
            //the whole text on my clipboard
            System.out.println("animal = " + animal);
        }

output:

BEAR

PARROT

FROG

HORSE

animal = BEAR

So it just read the first newline character, BEAR.

• So I tried with a local Scanner(System.in) variable.

        Scanner input = new Scanner(System.in);
        while (true) {
            String animal = input.nextLine(); // I copy
            //the whole text on my clipboard
            System.out.println("animal = " + animal);
        }

output:

BEAR

PARROT

FROG

HORSE

animal = BEAR

animal = PARROT

animal = FROG

animal = HORSE

It read all of the newline characters in the clipboard.

Can someone explain, what's going on? Maybe the question is more about the buffer than an anonymous intance of Scanner.

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psdta: So sorry for so many edits, I really struggled formatting the text.