If you stick your neck out, it means you take a risk by saying or doing something that other people might not like.
John stuck his neck out and told the boss what we thought of him.
He decided to stick his neck out and buy a new sports car, even though he hadn't asked his wife.
If you are up to your neck in something, it means you are really busy with it or heavily involved in it.
Dave is up to his neck with his studies and has no time to go out with his friends.
Giraffes are the tallest living land animals. They can grow to a height of 5.3 metres. A group of giraffes is called a tower. They are mainly found in Africa and can reach a running speed of up to 60 km/h.