https://www.abc.net.au/news/2024-10-26/nsw-far-south-coast-bird-calling-olympics/104521500
A very cute news item. My best bird call would be a rainbow pitta. My partner and I use it to attract each others attention when out and about. My partner does a very good whistling kite.
I can do a mourning dove 
American Bittern
I can’t do it, and I’m not a bearder, but I remember @russjones in 2010? making a Screech Owl noise
(Megascops asio)
to call them in, and they came flying in, just like pets. It blew my mind!
I just watched the video. Those kids are amazing! Even though they imitated a lot of species with harsh and unpleasant calls (parrots, corvids, etc.). They did a great job!
I guess doing this in the field is a no-no now in birding circles, because you trick the bird into spending precious energy defending territory or whatever (defending it from you), so you’re disrupting natural behaviours?
Ecological literacy is at an all-time low now, so if you can do even a halfway recognizable voice impression of any animal (not just a bird), lots of people will think you’re amazing!
I can do Tengmalm’s owl (Boreal owl, Aegolius funereus) well enough to attract them. First time I was able to do it (I was 13), after my biology teacher taught the technique during our biology club’s overnight trip, I was thrilled. I had practiced it for two months. Gave a really strong feeling of connection with nature.
How are they harsh and unpleasant? They’re beautiful!
I can’t do it, but I always enjoy doing curlew calls.
Doing pigeon coos always makes kids giggle as well : )
I used to be able to do the “whit whit” sounds turkeys make,when I worked for a park/farm. I thought it meant “food girl food girl”.
I make “chuck chuck” sounds when crossing a foot bridge across a piece of swamp. It seems to chill out the red winged black birds and maybe some perching birds.
Same! Also black-capped chickadee is really easy too.
Warblers are easy as well if you can whistle at the right octaves.
I can only imitate a human, but I do that FLAWLESSLY. However, I like to try American bittern and black sicklebill.
I can’t imitate any bird calls in a way that would convince another bird.
I would most like to convince the crows that I am one of them. But no matter how urgent and deep and raspy I make my “Caw! Caw! CAWs!” they take offense and flap off. I fear I am inadvertently saying something insulting. Or perhaps it is the mere fact that I have the audacity to try to speak to them at all, that offends them…
I can honk like a Canada Goose well enough that flying geese will turn their heads and look.
Mourning Dove and Great Horned Owl, both well enough that I get answers. I also used to do a passable Whipporwill, but I’m out of practice. Trying to learn Common Raven as well; they seem kind of amused by my attempts, and I have a feeling that I’m saying something like the corvid equivalent of “My hovercraft is full of eels.”
I used to be able to do a pretty decent screech owl call. I stopped doing it because a couple of blue-gray gnatcatchers came out of some trees when I was hiking in the spring and doing the call. They were clearly upset. I don’t want to cause stress to the birds like that anymore.
I can do a pretty good Bullfrog!
As for birds, my best is a day-old Domestic Chicken. Not too bad at the Mallard, either.
Yes! The bullfrog is my best animal imitation! I did it once for some captive male bullfrogs, and they were NOT happy. They tried to challenge me through the glass
The Dumetella carolinensis in my hometown taught me their language, and when I return to the same area they remember me. I’m better at the cat-sounding calls than their more complex songs, though. I’m also really good at cat cat noises for some reason, but believe it or not cats are not birds.
Eurasian collared dove. Its kinda rare in our locality. I’ve tried to fool people using the imitation, but it hasnt worked so far. 
Imitation has fooled Merlin tho.