Landorus-T looks more like a flying tiger than a bird, and tigers belongs to those land animals. Instead of using Landorus-T, I tried Gligar and Gliscor, both can still check Zekrom but are unfortunately weak. Thankfully, Zekrom is slow, so it doesn't really get much free switch ins except against Skarmory. Of course, I can still try it out, and yeah I did tried Landorus-T before, with Expert Belt and it was ok, but he will have to fit in other bird teams not the original.
I tried Lugia, it is in one of the teams I listed in the hide tags. Thanks for mentioning though!
As for the list your mentioned:
Zekrom is harmed by Spikes so nope
Swellow and Braviary are both tried and they suck, despite that Guts Facade, Swellow doesn't do much, and isn't that strong. Would have been better with a higher Speed stat, Darkrai-tie sucks, and I had a Braviary team listed in the RMT. Check it out at the bottom of the thread.
Scizor isn't a bird, it's a bug LOL Bugs can't be birds, they are just bird food. Druddigon can't fly, and doesn't look like a bird in any way, not elegant at all, just like the fat land monsters.
Salamence is tried and it works, read the whole thing and you can see I mentioned it. Golduck is a duck but it sucks, because Cloud Nine doesn't do anything and it is so weak by Uber standards and slow.
Crobat was ok but it's just weak and base 130 Speed helps but not no good STAB or coverage moves outside of Brave Bird. Cross Poison sucks. I still tried Crobat before because I thought I can use it to beat Darkrai and friends.
Scyther is obviously a bug sorry. Gyarados lives in the sea, being favorite doesn't really make him an exception. Siding with Kyogre is just unacceptable, if Gyarados is a bird then he must be some prehistoric bird without wings and feathers.
Sigilyph sucks, too weak and fragile, not to mention bad typing, Magic Guard doesn't help a lot. Dragonite is tried and doesn't look like a bird, Dragons =/= birds. Salamence is different because Bagon behaves like a baby bird, Dragonite starts out like a snake so nope. Xatu is tried and is in one of the teams listed.
Thanks, wow that is some nice list but Porygon2 is a bird and it isn't on your list! Too bad it isn't fast and takes damage from Spikes.