Löffler
During the Spring and Autumn many species stopover on the Tagus during their migration these include curlew sandpiper ("Calidris ferruginea") in large numbers with many other shorebirds in smaller numbers, Common redshank and Balck-tailed Godwits reach their peak numbers during migration too. Other migrants which may be seen include Eurasian spoonbill ("Platalea alba"), Mediterranean gull ("Larus melanocephalus") and black tern ("Chlidonias niger") and many passerines.