Annet, Isles of Scilly have nationally important breeding populations. The storm–petrel breeds amongst the boulders of the more stable storm beaches. The largest population of Manx shearwater ("Puffinus puffinus") in the islands breed here and the other annual breeding species are puffin ("Fratercula arctica"), greater black-backed gull ("Larus marinus"), razorbill ("Alca torda"), kittiwake ("Rissa tridactyla"), fulmar ("Fulmarus glacialis"), herring gull ("L. argentatus") and shag ("P. aristotelis"). Common tern ("Sterna hirundo") breed on the island most years as do cormorant ("Phalacrocorax carbo") and very rarely Arctic tern ("S. paradisaea"). Annet has long had a reputation for being the best island for breeding birds and Jessie
Giannutri in the northern part which become "garrigue" in the southern. Plants as "arbutus", "Myrtus", "pistacia lentiscus", mock privet, Mediterranean buckthorn, "juniperus phoenicea" and "limonium sommierianum" knew only on Isola del Giglio and Montecristo, grow up on the island. The mild climate has favoured the growth of plants such as "euphorbia", palm trees and wild orchids. The marine flora is abundant in sponges, madreporaria, black coral and red coral. The island, as all that of the Tuscan Archipelago, is a place where the bird migration take a stop along their seasonal movement from North to South. The Audouin's gull, Puffinus yelkouan,