Conditions presented flat calm seas (Sea State 0) and excellent visibility, broken only by a short, very light shower late in the morning.

Marine mammal sightings were highlighted by 85 Grey Seals recorded around the island—including 49 at Carreg yr Henwy, 26 at Henllwyn, two at Solfach, four along the West Coast, and four at the North End. Offshore counts included three Common Dolphins off the North End and three Harbour Porpoises accompanied by a calf along the West Coast.

Insects took full advantage of the clear conditions, led by 16 Meadow Browns, 12 Painted Ladies, eight Red Admirals, three Green-veined Whites, two Small Tortoiseshells, a Large White, a Common Blue, a Speckled Wood, and a Grayling up on the mountain. Day-flying moths and dragonflies included 10 Silver Ys, four Humming-bird Hawk-moths, two Rush Veneers, two Migrant Hawkers, and a Common Plume moth.

Seabird movement was dominated by a passage of 4,003 Manx Shearwaters, mostly moving past the South End and West Coast during the morning. Other notable seabirds and waterbirds included 65 Gannets, 46 Shags, 44 Sandwich Terns, 16 Mallards at Solfach, 15 Cormorants, 12 Great Black-backed Gulls, 10 Kittiwakes, six Razorbills, five Grey Herons, four Storm Petrels on the East Side (including an adult attending a chick), three Mediterranean Gulls (one wearing a white darvic ring), two Fulmars, and a Great Skua off the South End.

Sandwich Terns on Carreg yr Honwy (c) Steve Stansfield

Waders and gulls around the coasts and Narrows included 101 Oystercatchers, 77 Herring Gulls, 45 Curlews, 23 Turnstones, 19 Black-headed Gulls, 14 Redshanks, seven Lapwings, six Lesser Black-backed Gulls, three Dunlins, three Ringed Plovers, two Whimbrels, two Common Sandpipers, and a Purple Sandpiper. One of the Whimbrels carried a color ring combination fitted on the island in September 2016.

Lapwing (c) Steve Stansfield

Some movement was evident today with seven Tree pipit noted passing over the island during the morning. Other new arrivals included a Barn Owl and a Song Thrush at Nant. Other sightings across the island included 122 Swallows, 75 House Martins, 46 Linnets, 19 Rock Pipits, 17 Willow Warblers, 17 Choughs, 12 Woodpigeons, seven Dunnocks, seven Robins, seven Tree Pipits, five Chiffchaffs, four Sand Martins, four Alba Wagtails, three Blackcaps, three Pied Wagtails, two Peregrines (an adult male and juvenile female), two Whitethroats, two Stonechats, a Sparrowhawk, a Meadow Pipit, a Wheatear, a Blackbird. Trapping and ringing efforts added four Chiffchaffs, two Blackcaps, two Willow Warblers, one Dunnock, one Robin, and one Song Thrush.