https://www.chickensandmore.com/how-to-tell-a-rooster-from-a-hen/
Roosters will have a larger comb and wattles. Both should be firm to the touch, feel a little waxy and have good, deep coloration. The neck and shoulder area will usually be adorned with hackles. These are long, pointed neck feathers that flow down into the back. Hen's feathers will be more rounded.

https://www.backyardchickens.com/articles/the-complete-guide-to-telling-a-rooster-from-a-hen.77466/
It is important to know how and when a chick develops before you can really tell a rooster from a hen. You'll have a better idea of what to expect and what to look for. Chicks are fluffy and covered in down during their first week of life. You may, however, observe some feathers emerging after the first week.

https://chickenscratchny.com/3-fool-proof-ways-to-tell-roosters-from-hens/
This is my main method of telling hens from roosters. The object here is to identify the boys. If there aren't any saddle feathers you can be pretty certain you've got a lady. There are a few exceptions to this rule. Silkie, Sebright, and some Golden Campine roosters are called 'hen feathered' because they lack the district saddle and

https://www.backyardchickensmama.com/how-to-tell-a-rooster-from-a-hen/
Behavior Differences in Roosters and Hens. Male chicks tend to stand up taller, more upright, than female chicks. Both male and female chicks will chest bump, but when they get a little bit older and do this, a males long, pointed hackle feathers will stand up and be much more noticeable.

https://chickenandchicksinfo.com/how-to-tell-if-a-chicken-is-a-rooster/
Look at the Comb and Wattle. The next way to tell if a chick is going to grow up to be a rooster or a hen is to keep an eye on how their comb and wattle is developing. The age at which a chicken's comb starts to develop varies a lot depending on the breed, so keep an eye on your chicks as they age. Roosters will (almost) always have bigger

https://thenovicehomestead.com/how-to-tell-a-rooster-from-a-hen/
8. Crowing or Egg-Laying. This is the final, almost foolproof way to tell what you have a hen or a rooster. At some point, a rooster will start crowing…and the sound is unmistakeable. Yes, some hens may mimic the crowing sound, but I haven't observed it in young birds.

https://livingwellmom.com/hens-and-roosters/
3. Rooster vs hen behavior differences. Roosters are often bolder than hens. You might notice this behavior in small chicks. As they get older, roosters will tend to "challenge" each other with raised hackle feathers. But this behavior isn't exclusive to the boys because even the girls "challenge" on occasion!

https://grubblyfarms.com/blogs/the-flyer/how-to-identify-a-rooster-vs-hen
Here are some traits to look for in Rhode Island Red pullets and cockerels: Roosters: A stocky & block-shaped body, thicker & longer legs, large feet, taller comb, and bigger wattles that are bright red. Hens: short and rounded feathers, more pink-colored comb and wattles, smaller frame. #4. Ameraucana Rooster vs Hen.

https://www.mypetchicken.com/blogs/our-blog/how-to-tell-a-rooster-from-a-hen
Here are the most common ways to tell a rooster from a hen: 1. Size and Build: One of the most apparent differences between roosters and hens lies in their size and overall build. Generally, roosters tend to be larger and more robust than hens. They have a more upright stance, with a larger and more prominent comb on top of their heads.

https://www.newlifeonahomestead.com/rooster-hen-differences/
For example, a hen will lower her tail to signal that she is ready to mate, while a rooster will raise his tail to show that he is feeling aggressive. The tail feathers also help chickens to maintain balance when they are flying or attempting to fly, through the air.

https://thehomesteadinghippy.com/hens-versus-roosters/
Hens Have Thinner Legs and No Spurs. A great way to tell hens and roosters apart is in the stoutness of their legs and the presence of spurs. Roosters have thick, tough legs with long, viciously pointed spurs on the back that they use to fight off predators and male contenders for their throne.

https://chickenhype.com/how-to-tell-a-rooster-from-a-hen-5-easy-differences-explained/
Roosters are usually more aggressive and territorial than hens 4. Check the bird's wattles and combs. These are the fleshy protuberances on the chicken's head, and roosters tend to have larger ones than hens 5. Examine the shape of the bird's body. Roosters are usually larger and heavier than hens, with broader chests.

https://www.theeverydaymomlife.com/rooster-vs-hen/
The Easter Eggers are a medium-sized breed, but the roosters are usually bigger and taller than the hens. You can tell the difference in their size from as young as ten weeks old. The cockerels start growing combs and wattles at about 6 to 10 weeks old, while the pullets might take up to 20 to 26 weeks.

https://www.hgtv.com/outdoors/gardens/animals-and-wildlife/how-to-tell-a-rooster-from-a-hen
If the egg has a pointed tip, it's a rooster. Hold them upside down by their feet and the rooster will spring back up quickly. A threaded needle held over the bird's head will swing back and forth over a rooster and in a circular motion over a hen. There. That wasn't so hard.

https://chickenpets.com/questions/tell-rooster-hen-tips-tricks
Roosters typically have larger, more prominent combs and wattles than hens. Combs are the fleshy, often red, ridges on top of a chicken's head, while wattles are the similar structures hanging from the lower sides of their head. This difference usually becomes noticeable when the chickens are a few months old.

https://thehensloft.com/how-to-identify-rooster/
With chicks, gently place their heads between your pinky and ring finger and cradle their bodies in your hand. Gently press below the vent to remove any poop from the vent area, then carefully open up the vent with your fingers. Examine the cloacal folds inside. If you see a bump or a bubble, it is a rooster.

https://www.youtube.com/watch?v=X2tFYuy8BCU
From Serama Chicks to Hen and Rooster. Timelapse Chicken Transformation Comparison (Chick Gender identification). Determine the gender in all Growth stages.

https://ourinspiredroots.com/how-to-tell-if-your-hen-is-a-rooster/
Physical: A rooster has longer and more pointed hackle feathers that are more reflective than a hens (although our Rhode Island Reds have very reflective hackle feathers) The comb and wattle appear sooner and are bigger and more red. Bigger, thicker feet and legs. Only the male has saddle feathers (feathers that point down around the tail) and

https://thehipchick.com/ways-to-tell-a-rooster-from-a-hen/
With very high accuracy, checking the vent can help you tell whether a chick is a hen or a rooster. Male vents will have a small bump that indicates the formation of male genitalia. If there's no bump, your chick is likely a hen. However, some chicken breeds don't develop the bump for a few weeks, so the results on the first day could be mixed.

https://garvillo.com/how-to-tell-a-rooster-from-hen/
Discover the various ways to tell a from a by observing their physical attributes, behaviors, and feather variations. Physical Differences Size and Shape

https://mainehomesteadmagazine.com/2018/02/22/how-to-tell-a-hen-from-a-rooster/
5: Hens don't develop spurs. All chickens have a little lump where a spur will or will not develop, much like nipples on a human—but only the rooster will grow long pointed spurs. Another simple way of how to tell a hen from a rooster by simple observation is to look at the back of their legs for spurs.

https://blog.omlet.us/2021/11/24/how-to-tell-a-rooster-from-a-hen/
Looking at the tail feathers of your birds is another way to distinguish between a male and female chicken. Saddle feathers are a type of tail feather, which extend on from a chicken's back and actually sit in front of the tail. While both hens and roosters have saddle feathers, with female chickens, these are rounder than the saddle feathers

https://noodls.com/pets-animals/how-to-tell-rooster-from-hen/
Introduction. Determining the gender of chickens, specifically distinguishing between roosters and hens, is a fundamental aspect of poultry farming and backyard chicken keeping.