- 1 Regular Eggs
- 2 Egg Blocks
- 3 Level Specific Eggs
- 4 Making Eggs
- 5 Egg-Aiming and Egg-Shots
- 6 Egg Catching
- 7 Baxter Shot
- Yoshi can carry up to 6 eggs at a time. However, if Yoshi is aiming an egg, it does not count towards his total and he may pick up another egg. If aiming is cancelled, an egg will be lost.
- Eggs can ricochet up to 3 times off of surfaces like walls, floors and ceilings, regardless of it's starting color.
- Each subsequent ricochet will change the color of the egg in the progression of green, to yellow, to red.
- Eggs will break after colliding with enemies or other interactive sprites like flowers and winged clouds.
- If an egg hits a surface after it's 3rd ricochet, it will die and fall off-screen. It can also open gates while in this state like in 2-1 100%. 
- Eggs can destroy certain enemies without breaking, like bats and skeleton fish, but will die upon hitting the next surface.
These produce a single coin after breaking. While not useful in this state, yellow eggs can be ricocheted into an enemy to produce 2 stars, which would be helpful in 100% speedruns. A notable example of this is in 6-7.
These produce 2 stars after breaking. Red eggs are a quick way to get stars but require specific planning of egg-shots to not lose time. These are commonly used in 100% to skip mid-rings and recover lost stars after getting hit. The egg route in 3-2 is a good example of this.
Throughout the game, you will encounter blocks that resemble eggs. The most common one is the green egg block  which, when hit, will give you an egg. Depending on your position, the egg will fly out to the left or to the right. If you have 6 eggs, it will not dispense any more.
Level Specific Eggs
Some eggs can only be found in certain levels and under normal circumstances, they cannot be taken out of the level, unlike regular eggs.
Flashing eggs only appear in 3 levels: 1-6, 1-7 and 4-E.
These eggs contain a red coin and count towards the 20 red coin total for the level and thus, are not optional in 100% speedruns. The red coin can be obtained by either breaking the egg on an enemy/interactive sprite, then collected like normal or carried into the goal ring where it's counted automatically. The flashing eggs behave like normal eggs otherwise.
- Big eggs can be made by swallowing a big shy guy.
- These eggs travel in a downward curve, instead of a linear path like normal eggs.
- When a big egg hits the ground, it will turn all the enemies on screen into stars. (3-4 and 6-8 boss fight big eggs are exceptions).
- This is used in 2-7 to fill up all of the available sprite slots to prevent the bullet bill launchers from being loaded. See: 2-7 sprite overload.
- They can also be used to create additional stars in 100% speedruns.  
Since big eggs fall downward after being thrown, it is possible to Baxter the egg so the next Yoshi can collect it, allowing it to be used in the next level. The egg's sprite will be glitched, (since they do not exist in the level's tile-set) but will otherwise act normally. This is an important technique to master for the Any% Warps category in order to perform the 3-3 tongue glitch which allows you to skip the submarine section.
- The official name is Huffin Puffin but everyone calls them chickens.
- These projectiles resemble baby ducks/chickens and act as boomerangs which return to Yoshi after being thrown.
- They can be obtained by touching them after throwing an egg or jumping on the mother chicken.
- They can ricochet 3 times off of surfaces just like normal eggs and die after the 4th.
- When canceling the aiming of a chicken, there is a 1 in 3 chance that it will be dropped.
- They can even fly in continuous circles around Yoshi if you throw them just right! 
Egg-Aiming and Egg-Shots
- With the control scheme set to hasty, you can press and quickly release the A button to do an egg-shot that will always have the same angle.
- It is a 9 frame window to release A but it's as easy as just tapping the button. This is very useful because it allows egg-shots to be made consistent. This technique is used countless times in speedruns. For example, in 2-3.
- If the control scheme is set to patient, there is only a 1 frame window to shoot after aiming to get the "neutral-angle". Because of this, in a category like 100% where consistent egg-shots are incredibly important, it is highly recommended that you play on hasty.
In Any% Warpless, playing on patient is fine, in fact, top runner Yamayuu plays on patient.
Rising and Falling Neutral
Whether Yoshi is moving up or down influences an egg's trajectory. This is most apparent in neutral egg-shots.
- Doing an egg-shot and then jumping results in a higher-angled shot.
- Doing an egg-shot while falling results in a lower-angled shot. The closer Yoshi is to the ground while falling, the lower the angle will be.
There are 2 types of upward egg-shots, straight and angled.
- To do a straight up-shot, you have to stand still, hold up for 9 or less frames and tap A. With the patient control scheme, you'll have to hold up the entire time or lock the cursor.
- To do an angled up-shot, hold up for at least 10 frames and tap A. This shot will always happen when running and shooting upwards. It will also make Yoshi face the opposite direction, as demonstrated in the gif.
- Eggs can only be tongued after a certain amount of time has elapsed after throwing them, (i.e. you cannot throw an egg and immediately tongue it).
- The general direction an egg moves when tongued is dependent entirely on Yoshi's speed and direction he's travelling.
- If Yoshi is standing still, the egg will move towards Yoshi.
- If Yoshi is running to the right and tongues an egg, the egg will move with Yoshi to the right.
- The faster Yoshi is going, the faster the egg will go. However, the position of Yoshi when the egg is tongued changes exactly how fast the egg will move.
- If an egg is behind Yoshi when you tongue it, it will speed up to "try to catch up."
- If an egg is in front of Yoshi when you tongue it, it will slow down to let you catch up.
- To produce the fastest moving eggs, you want to tongue an egg while moving as fast as possible when the egg is behind Yoshi.
The video demonstrates first, how an egg tongued when standing still, simply moves towards Yoshi. Then, all the eggs in the room are tongued while Yoshi is behind/directly under them. This causes them to move forward, but slowly. Lastly, all of the eggs are tongued after Yoshi has already passed them. They fly much further and faster. This is very relevant for achieving the Baxter Shot.
Eggs can be tongued indefinitely and since they follow Yoshi's movements, more or less, they can be continuously juggled to follow Yoshi!
This is demonstrated in the video and is used extensively in the 100% tool-assisted speedrun.
Here is an explanation of what a TAS is.
Named after the TASer Baxter who discovered them, the Baxter Shot (Baxter for short) is performed by tonguing an egg over the goal ring at the end of the level. If the egg flies far enough, the next Yoshi will pick up the egg and it can be used in the subsequent level.
Pretty much anything can be Baxtered:
- Regular/flashing eggs (swag).
- Big eggs  (useful for 3-3 map corruption).
- Stars  (these will count towards the total of the level you are currently in)
- And even Keys!  (Not RTA viable).
This trick is used to carry over chickens or big eggs into the next level. To do this, you have cancel egg-aiming on the same frame you enter the goal ring. This is not recommended for new players.
Chickens can also be taken out of the level they are from by doing a 1-1 warp but will have a glitched sprite (since they do not exist in the level's sprite-set). They will otherwise act normally.
See: Chicken Baxter for more information on this trick.