What do birds short necks help them to do? pls help :/

Explanation:

Most diving birds have (relatively) long necks and shorts legs, although their necks aren't as long as say herons, storks or egrets. Take the common loon for instance. Their necks can be up to half as long as their bodies but their legs are so short and set so far back that they are very awkward on land.

they can extend it out and twist their head around so easy

Explanation:

i think it is true in my reasonment ..