These little flying creatures are found all throughout the Star Wars Play Sets, find all of them in a Play Set to unlock a vehicle in the Toy Box.
The characters Princess Leia, Han Solo, and Chewbacca from the Rise Against the Empire set possess the ability to see Mynocks on the radar, when near a Mynock you will be able to see a small black dot on the radar marking its location. In this Play Set you will need to find their Champion Coins before you can use them.
In space it will additionally have a triangle pointing up or down to tell you whether the Mynock is above or below you - but be warned that while in space sometimes the radar will mess up and become incredibly short ranged, if you think this has happened just take your figure off the base and then put it back on.
Here's a guide to the locations of the 100 Mynocks in the Twilight of the Republic Play Set.
There are 13 Mynocks on the surface of Geonosis, seven outside and six inside the Droid Factory.
On platform above where you find Darth Maul's Champion Coin, use a pipe to get up and then jump across.
On the first conveyor belt in the factory go to the right and jump through a single gap in the side to a platform.
After the second conveyor belt jump up some round platforms around the edge of a larger circular platform.
There are ten of them flying around in space. All hanging around by asteroids... and there are a lot of asteroids. So rather than have ten identical looking screenshots of Mynocks flying next to giant asteroids here is a single one from afar with their general locations marked. The view is from the left (port) side of the Star Destroyer.
Number 10 is probably a bit further to the right, it's quite confusing with so many smaller asteroids. It's certainly around that area at least.
Seventeen of the things on Coruscant, most outside but three are in the temple.
At the top of the tallest tower at the bottom edge of the left island, probably need a flying vehicle to reach.
Hanging on the bottom of the upper platform on the back left side of the temple, near the holotraining.
Another ten flying about in this endless space. This time nine of them are having a fun time flying about next to satellites and thanks to the draw distance they're next to impossible to see from afar. The other one is on the little space station with the turret challenge. This image is unlikely to be much help as it is impossible to get all of the satellites to appear at the same time, if you're missing one just go check out each satellite.
Number 10 is the one on the turret space station thing.
There are seventeen Mynocks on Tatooine, all in the main area. So none in the Pod Racing or Jabba areas.
Enjoyed finding them next to satellites? Well here's some that are by satellites but one that's just flying around by itself. Fun! There also two on the lava moon, one closely circling the challenge marker and the other a bit high up above around the same area with a very wide flying circle.
Number 6 is the one that's flying by itself.
There are thirteen Mynocks on Naboo.
Flying around one of the purple energy beams in the final Maul room, you'll need to do a mission to get up there.
In a room off the side of where you fight Maul for the second time, use a Tech pad to open it. Red laser door only opens after fully defeating Maul.
And now the final ten in space above Naboo. One is on the space station near the launch pads and the rest are all by satellites around the two Star Destroyers.
Number 7 is the space station.
Collecting all 100 Mynocks will earn you the "Mynock-ular Vision" Feat and the "ARC-170 Starfighter" for use in the Toy Box.