This survey identifies the habitats that are contained within or make up a site, and the key plant species for each of those habitat types. It will also provide target notes on important aspects of the site, for example, the presence of a rare plants or animals, or a special habitat feature such as an ancient hedgerows. A Phase 1 survey can be carried out at any time of year but it is best done in spring or summer, when the vegetation types that characterise a certain habitat are more readily identifiable. Some consultants carry out what are called extended Phase 1 surveys that provide more information, particularly on vegetation of a site, than a Phase 1 survey.