It was another day packed full of big numbers of commoner migrants, most of which flew over the island. 732 Swallows, 408 House Martins and 318 Meadow Pipits made up the bulk of the overhead passage, along with 33 Grey Wagtails, 12 Tree Pipits and eight flava Wagtails. Two Ospreys which flew low over the mountain were a bit of a highlight for those lucky enough to be stood under their flight path, and a Merlin was seen briefly on the North End. An Atlantic Bluefin Tuna was once again seen off Pen Cristin where it spent the evening hassling Mackerel. This time Ben was on hand to get a fantastic action photo of this exotic visitor.

Other sightings today included seven Fulmars, 5330 Manx Shearwaters, 39 Gannets, two Grey Herons, two Sparrowhawks, nine Kestrels, two Peregrines, 16 Ringed Plovers, three Dunlins, seven Redshanks, a Common Sandpiper, three Turnstones, two Arctic Skuas, two Mediterranean Gulls, 38 Black-headed Gulls, 26 Common Gulls, 524 Kittiwakes, 146 Sandwich Terns, a Guillemot, two Razorbill, a Little Owl, a Great Spotted Woodpecker, two Skylarks, three Sand Martins, 79 White Wagtails, 22 Robins, two Whinchats, 18 Stonechats, eight Wheatears, a Song Thrushes, a Grasshopper Warblers, two Whitethroats, a Garden Warblers, two Blackcap, 12 Chiffchaffs, eight Willow Warblers, three Goldcrests, three Spotted Flycatchers, six Chaffinches and 143 Linnets.

The two juvenile Ospreys took a low flight path straight over the Observatory, staring us down as they passed.

Atlantic Bluefin Tuna has become a more and more regular sight off the coast of Cornwall in recent years. With sea temperatures fluctuating and slowly increasing, perhaps we'll start to see more of these huge fish in Cardigan Bay. © Ben Porter