I’ve divided the list into not-very-taxonomically-coherent chunks to make it easier to read.
Little Grebe
Great-crested Grebe
?Mediterranean Shearwater
Cormorant
Little Bittern
Cattle Egret
Squacco Heron
Little Egret
Grey Heron
Purple Heron
White Stork
Glossy Ibis
Spoonbill
Flamingo
Greylag Goose
Mallard
Gadwall
Shoveler
Garganey
Pochard
Red-crested Pochard
Griffon Vulture
Short-toed Eagle
Booted Eagle
Black Kite
Marsh Harrier
Kestrel
Lesser Kestrel
Peregrine
Red-legged Partridge
Moorhen
Coot
Purple Swamphen
Avocet
Black-winged Stilt
Collared Pratincole
Ringed Plover
Kentish Plover
Grey Plover
Sanderling
Dunlin
Curlew Sandpiper
Common Sandpiper
Redshank
Black-tailed Godwit
Bar-tailed Godwit
Whimbrel
Black-headed Gull
Yellow-legged Gull
Audouin’s Gull
Great Black-backed Gull
Little Tern
Gull-billed Tern
Royal Tern (!!)
Whiskered Tern
Wood Pigeon
Collared Dove
Cuckoo
Great Spotted Cuckoo
Little Owl
Swift
Pallid Swift
Hoopoe
Bee-eater
Ring-necked Parakeet
?Blue-crowned Parakeet
Crested Lark
Calandra Lark
Sand Martin
Swallow
House Martin
Tawny Pipit
White Wagtail
Yellow Wagtail
Wren
Robin
Nightingale
Wheatear
Stonechat
Blackbird
Garden Warbler
Blackcap
Sardinian Warbler
Whitethroat
Dartford Warbler
Sedge Warbler
Zitting Cisticola
Savi’s Warbler
Cetti’s Warbler
Reed Warbler
Great Reed Warbler
Melodious Warbler
Chiffchaff
Spotted Flycatcher
Pied Flycatcher
Great Tit
Blue Tit
Long-tailed Tit
Short-toed Treecreeper
Woodchat Shrike
Azure-winged Magpie
Magpie
Jackdaw
Carrion Crow
Raven
Spotless Starling
Golden Oriole (heard)
House Sparrow
Tree Sparrow
Chaffinch
Linnet
Goldfinch
Greenfinch
Serin
Corn Bunting