Hm...favorite bird? Tough one, there are just too many but lemme try:
Woodland Kingfisher, just love their call!!
And then there's of course Natal Spurfowl, African Barred Owlet, Swamp Nightjar, Pacific Golden Plover, Shikra, Malagasy Pond-Heron, Atlantic Yellow-nosed Albatross, African Paradise-Flycatcher, Pale Batis, Barred Wren-Warbler, Spotted Ground-Thrush, Red-capped Robin-Chat, Chorister Robin-Chat, Kalahari Scrub-Robin, Village Indigobird, Comb Duck, Green-backed Honeybird, African Openbill, Large-billed Lark, White-chested Alethe, Magpie Mannikin, Brimstone Canary, Denham's Bustard, Greater Painted-snipe, Zitting Cisticola, Robert's Warbler, Yellow-crowned Bishop, Green Barbet, Green Tinkerbird, Green Malkoha, Lemon Dove, Emerald-spotted Wood-Dove, African Green-Pigeon, Grey Crowned Crane, Common Greenshank, Ruddy Turnstone, Red Knot, Water Thick-knee, Southern Pale Chanting Goshawk, Black-backed Puffback, Stripe-cheeked Greenbul, Karoo Eremomela, Green-backed Camaroptera, Stierling's Wren-Warbler, Copper Sunbird, Streaky-headed Seedeater, Moustached Grass-Warbler, Madagascar Bee-eater, Olive Sunbird, Grey-winged Francolin, Barred Long-tailed Cuckoo, Common Ringed Plover, Lesser Sand Plover, Long-tailed Jaeger, Magpie Shrike, White-browed Robin-Chat, Mountain Wheatear, Meves's Starling, Long-tailed Widowbird, Mountain Wagtail, Eastern Bronze-naped Pigeon, Rock Pratincole, White-crested Helmet-Shrike, Southern Hyliota, Red-winged Francolin, Red-billed Spurfowl, Red-necked Spurfowl, Red-fronted Tinkerbird, and Green Wood-Hoopoe too.
Or the sound of Burchell's Coucal in the distance, on a hot summer's day... that's Africa for me!

But let's not forget Southern Carmine Bee-eater, African Emerald Cuckoo, Ross's Turaco, Allen's Gallinule, African Snipe, Common Whimbrel, Common Redshank, Senegal Lapwing, Collared Pratincole, Rufous-chested Sparrowhawk, Ayres's Hawk-Eagle, African Hobby, Little Grebe, Sooty Albatross, Grey Petrel, Anchieta's Tchagra, Brown-crowned Tchagra, Crimson-breasted Shrike, African Red-eyed Bulbul, Tiny Greenbul, African Reed-Warbler, Wing-snapping Cisticola, Chestnut-backed Sparrowlark, Grey Tit-Flycatcher, Brown Scrub-Robin, Cape Glossy Starling, Miombo Blue-eared Starling, Southern Double-collared Sunbird, Southern Brown-throated Weaver, Southern Red Bishop, Red-collared Widowbird, Pearl-spotted Owlet, White-crowned Lapwing, African Wattled Lapwing, African Cuckoo Hawk, Verreaux's Eagle, Southern Bald Ibis, Common Fiscal, White-headed Saw-wing, Terrestrial Brownbul, Green-capped Eremomela, Hartlaub's Babbler, Southern Pied Babbler, Common Whitethroat, Cape Long-billed Lark, African Dusky Flycatcher, White-starred Robin, White-throated Robin-Chat, Green-backed Woodpecker, Whyte's Barbet, Yellow-fronted Tinkerbird, African Olive-Pigeon, Black Kite, Violet-backed Starling (Plums, Freda!!!

), African Harrier-Hawk, African Penguin, Yellow-bellied Greenbul, Yellow-streaked Greenbul, Eastern Nicator, Dark-capped Yellow Warbler, Yellow-throated Woodland-Warbler, Yellow-bellied Hyliota, African Yellow White-eye, Variable Sunbird, Yellow-mantled Widowbird, Yellow-throated Petronia, Yellow-fronted Canary, Southern Ground-Hornbill, African Palm-Swift, Southern White-crowned Shrike, Carp's Tit, Miombo Tit, Eurasian Reed-Warbler, Dark-backed Weaver, Rock Dove, Speckled Pigeon, Rock Kestrel.
And of course the majestic one: African Fish-Eagle, another sound you just gotta love! But also African Darter, Drakensberg Rock-jumper, Orange Ground-Thrush, East Coast Akalat, Karoo Scrub-Robin, Bronzy Sunbird, Orange-winged Pytilia, Cape Longclaw, Common Cuckoo, Burchell's Coucal, Common Swift, African Purple Swamphen, Eurasian Curlew, Greater Sheathbill, Spotted Thick-knee, Greater Sand Plover, Spur-winged Lapwing, Black-winged Lapwing, Crowned Lapwing, Brown Noddy, Western Marsh-Harrier, African Crowned Eagle, Eurasian Hobby, Great Egret, Eurasian Bittern, African Sacred Ibis, African Pitta, Eurasian Golden Oriole, Black-throated Wattle-eye, Barn Swallow, Sombre Greenbul, Sedge Warbler, Marsh Warbler, Karoo Prinia, Miombo Rock-Thrush, Cape Robin-Chat, Common Redstart, African Stonechat, Northern Wheatear, Common Starling, African Quailfinch, Green-winged Pytilia, Dusky Indigobird, Long-tailed Paradise-Whydah, African Pipit, Hartlaub's Spurfowl, Cape Spurfowl, Common Peacock, Hottentot Buttonquail, African Hoopoe, Ruff, Pomarine Jaeger, European Honey-Buzzard, Rüppell's Vulture, Great White Pelican, Black-and-white Flycatcher, Eastern Saw-wing, Little Rush-Warbler, Lesser Swamp-Warbler, Cape Clapper Lark, Yellow Bishop, Yellow-bellied Waxbill, African Firefinch, Purple Indigobird, African Rock Pipit, Cinnamon-breasted Bunting, African Pygmy-goose, Brown-backed Honeybird, Yellow-rumped Tinkerbird, Common Scimitarbill, African Pygmy-Kingfisher, Southern Black Korhaan, Common Black-headed Gull, Black-chested Snake-Eagle, Black Heron, Light-mantled Albatross, Retz's Helmet-Shrike, Cape Crow, Black Saw-wing, Dark-capped Bulbul, Blackcap, Rufous-winged Cisticola, Black-eared Sparrowlark, Southern Black Flycatcher, and Bearded Scrub-Robin.
Or the Amethyst Sunbird, Southern Masked-Weaver, Black-winged Bishop, Black-faced Waxbill, Black-eared Seedeater, Common Ostrich, Northern Pintail, African Grey Hornbill, Grey-headed Kingfisher, Knysna Turaco, African Grass-Owl, Verreaux's Eagle-Owl, Red Phalarope, Atlantic Petrel, White-chinned Petrel, Common House-Martin, White-tailed Crested Flycatcher, Cape Grassbird, Grey-backed Sparrowlark, Pale Flycatcher, Mocking Cliff-Chat, Southern Grey-headed Sparrow, Rosy-throated Longclaw, Common Chaffinch, Pallid Honeyguide, Acacia Pied Barbet, Levaillant's Cuckoo, Eurasian Oystercatcher, Pied Avocet, Blacksmith Lapwing, Parasitic Jaeger, Red-footed Falcon, Amur Falcon, Grey Tit, White-browed Scrub-Robin, Village Weaver, Fan-tailed Widowbird, Lesser Seedcracker, Purple-crested Turaco, African Wood-Owl, Blue-spotted Wood-Dove, Blue-mantled Crested Flycatcher, Ashy Flycatcher, Plain-backed Sunbird, Western Violet-backed Sunbird, Swainson's Spurfowl, Grey Go-away-bird, Square-tailed Nightjar, Northern Black Korhaan, Long-toed Lapwing, Southern Royal Albatross, Chestnut-vented Tit-Babbler, White-winged Widowbird, Protea Seedeater, Southern White-faced Scops-Owl, Southern Fulmar.
Ja, like I said, just too many!

But I wanted a 4000th post worth remembering!
*edit: repaired funny characters