Necky

Neckies are large brown vultures that prowl the skies and mines (uncharacteristically for birds) of Donkey Kong Island. They seem to be affiliated with the Kremling Krew.

Donkey Kong Country series
The first appearance of Neckies is in Donkey Kong Country as common enemies. Neckies try to attack Donkey Kong and Diddy Kong by flying into them, or by hitting them with coconuts. Neckies can be defeated by being jumping upon or hit by a barrel. Donkey Kong Country also features two Necky bosses named Master Necky and Master Necky Snr.

In the Game Boy sequel, Donkey Kong Land, they are exceedingly rare, and the flying variant seems to have been replaced by the enemy Hogwash.

There is also a smaller subspecies of Neckies called Mini-Neckies. In Donkey Kong Country and Donkey Kong Land, they fire nuts at the player; in Donkey Kong Country 2: Diddy's Kong Quest and Donkey Kong Land 2 they lose this ability and instead launch themselves at the player. Donkey Kong Country 2 and Donkey Kong Land 2 also has a Mini-Necky boss named Krow. Normal Neckies don't appear in Donkey Kong Country 2 or Donkey Kong Land 2 and neither species appear in Donkey Kong Country 3: Dixie Kong's Double Trouble or Donkey Kong Land III.

Donkey Kong 64
In Donkey Kong 64, two Buzzards appear in the area Angry Aztec. One of these Buzzards is located in the Temple where Tiny Kong is found, and must be blasted several times with Lanky's Grape Shooter in order to cause it to drop its Golden Banana. The other one is actually benevolent and capable of speech. After Diddy Kong frees the Buzzard from the cage it is trapped in near Snide's H.Q., it will challenge Diddy to a game; if Diddy can fly through all the rings it drops, he will reward Diddy with a Golden Banana.

Donkey Kong Racing
Neckies were seen in the trailer for Donkey Kong Racing in the background of when the logo was shown and when Kiddy was riding on Ellie along with many creatures aside from Kiddy. They were presumably going to be rideable creatures.

Donkey Kong Barrel Blast
Neckies appear as obstacles in Donkey Kong Barrel Blast and as flying creatures that players may knock into.

Super Smash Bros. series
In Super Smash Bros., Super Smash Bros. Melee and Super Smash Bros. for Wii U, silhouettes of Neckies can sometimes be seen projecting on the sunset sky of the Kongo Jungle stage. In Super Smash Bros. Melee, Super Smash Bros. Brawl, and Super Smash Bros. for Nintendo 3DS, Neckies can be too seen flying in the background of the arena Jungle Japes. Other than these minor appearances, Neckies do not have any other function in the games of this series.

Levels
Neckies can be encountered in the listed levels of the following games:

Donkey Kong Country

 * Jungle Hijinxs (throw coconut)
 * Winky's Walkway (flying)
 * Millstone Mayhem (throw coconut)
 * Vulture Culture (flying and throw coconut)
 * Tree Top Town (flying)
 * Forest Frenzy (flying)
 * Temple Tempest (flying)
 * Snow Barrel Blast (flying)
 * Slipslide Ride (flying)
 * Ice Age Alley (flying)
 * Trick Track Trek (throw coconut and flying)
 * Mine Cart Madness (flying)
 * Tanked Up Trouble (flying)
 * Necky Nutmare (throw coconut and flying) (GBC only)
 * Loopy Lights (throw coconut)
 * Platform Perils (flying)

Donkey Kong Land

 * Congo Carnage
 * Pot Hole Panic

Reference
Necky