Ngor spring migration: May 2018
Following on our April summary, here’s a brief update on results from last month’s short but regular seawatch sessions from Ngor, as usual all from the Club Calao terrace. Managed a total of 10 sessions between May 10th and May 26th, with more good stuff to report on, including a lifer!
Again, no pictures other than a few old ones that I’m recycling here… and yet again a pretty dull species list.
Wilson’s Storm-Petrel (Océanite de Wilson): unidentified storm-petrels were regularly seen in small numbers, and most likely referred to this species.
Cape Verde Shearwater (Puffin du Cap-Vert) were seen in good numbers on most days, feeding off Ngor or flying NE, with a max. of at least 540 birds in one hour on 26th. Not as many as last year when the maximum counted on a single day exceeded 5,000 birds (!), but the pattern of appearance and behaviour of birds is very much in line with the previous season.
Cory’s / Scopoli’s Shearwater (Puffin cendré / de Scopoli): at least three on 26th when there was a remarkable diversity of shearwaters, with five species noted. Probably also a few on 11th, 14th and 15th but too far or seen too briefly to positively identify.
Two to five Great Shearwater (Puffin majeur) seen flying NE amidst the other shearwaters on 26th – remarkably similar to last year’s record of two birds on May 25th, noted as “apparently migrating north” and thought to be the first May record – see the short paper we published in the latest volume of Malimbus on a “wreckage” of Great Shearwater in the the occurrence in Senegal & Gambia (Barlow et al. 2018), PDF available here on my ResearchGate page.
Sooty Shearwater (Puffin fuligineux): a few seen on 18th, 21st and 26th, with at least 12 birds on the latter date: these records suggest that this Southern Hemisphere breeder is slightly more numerous later in spring.
Boyd’s / Barolo Shearwater (Puffin de Boyd / Macaronésie): one on 21st seen at fairly close range was identified as Barolo Shearwater – for once it was close enough and I was able to follow it over quite a distance. Probably a bird en route to its breeding grounds. Another one, also flying north-east, was either baroli or boydi. The taxonomic situation of these small black and white shearwaters is complex and seems to be constantly changing. with BirdLife and HBW now treating both taxa as subspecies of Audubon’s Shearwater (Puffinus lherminieri). Either way, these are apparently quite rare spring records, though Dupuy (1984) lists what was then known as “Little Shearwater” as an uncommon offshore “summer” visitor. Boyd’s Shearwater breeds exclusively on the Cape Verde islands (only about 5,000 pairs!), while Barolo’s breeds further north on the Macaronesian islands where it is known from Madeira, the Azores, the Selvagems, and the Canary Islands, with a total breeding population of the same order of magnitude.
Northern Gannet (Fou de Bassan): seen in small numbers on most days; all but one were immature birds (and one on 15th may actually have been a Cape Gannet, but I couldn’t rule out a 4th year Northern Gannet as I didn’t see the underwing pattern…).
Red-footed Booby (Fou à pieds rouges): a species I’d never seen before but somehow expected to show up one day at Ngor, two were seen feeding in the surf just beyond the Ngor islet on 17th, nicely showing their pink (not red!) feet, bluish bill and uniform brown plumage. One was seen again the following day and what I assume are the same two birds (both dark morph adults or near-adults) on 22nd, when they appeared to take off from the islet where they may have spent the night. Third record for Senegal! More on this species, which will likely show up more frequently in coming years, in this recent post.
Brown Booby (Fou brun): just one record so far, of an immature (2nd c.y.) on 14th. Looks like the Iles de la Madeleine birds – if they are indeed still present – don’t wander around the peninsula too much.
A few Great While Pelicans were regularly seen, flying about or resting out at sea (and once on the islet), and on 26th a Pink-backed Pelican made an appearance (Pélicans blancs et gris).
Other than an Oystercatcher on 20th and three Whimbrels on 11th (and a few Common Sandpipers), no more waders were seen during May (Huîtrier pie, Courlis corlieu, Chevalier guignette).
Long-tailed Skua (Labbe à longue queue): following several records in the latter half of April, at least three were identified on 11th, one on 18th, and one on 26th – confirming that spring migration of this species occurs up to the end of May off Senegal. Pomarine and Arctic Skuas were much scarcer than in April, with just three records for the former and five for the latter species.
Audouin’s Gull (Goéland d’Audouin): up to three birds seen in any one session, though no notable active migrants as was the case in April; all were immature birds.
Sabine’s Gull (Mouette de Sabine) were recorded up to May 22nd, with four records of 1-9 actively migrating birds. Other gull species included 10 Grey-headed Gulls flying NE on 20th, and three Slender-billed Gulls on 22nd. A single Lesser Black-backed Gull was seen on 22nd, when a probable Kelp Gull was also present.
Single Bridled Tern (Sterne bridée) were seen feeding and flying around quite close to shore on 11th and 15th, bringing the total to three birds so far this season.
Lesser Crested Tern (Sterne voyageuse): seen twice (17th & 20th), unlike African Royal Tern (Sterne royale) which remained present in decent numbers throughout. Caspian Tern (Sterne caspienne) was seen just once, on 22nd.
Roseate Tern (Sterne de Dougall): following a decent passage in April, just one seen on 17th, though others may have passed through further offshore amidst Common and Arctic Terns (Sternes pierragarin et arctique). These two species were seen almost daily, but again in much smaller numbers than in April.
Three Whiskered Terns (Guifette moustac) flew past on 11th, followed by two White-winged Terns (Guifette leucoptère) on 21st. Black Terns (Guifette noire) were less numerous than in April, except on May 11th when about 300 birds were counted.
Let’s see what June brings! Assuming that I manage to make it out to the Calao…