crocodiles

a large reptile with a hard skin that lives in and near rivers and lakes in hot, wet parts of the world. It is like an alligator, but it usually has a longer and narrower nose:

Examples:

a line of people, especially children, who are walking in pairs

a large, hard-skinned reptile (= type of animal) with a longer and narrower nose than that of an alligator which lives in and near rivers and lakes in hot, wet places