>>49886706Firstly chicks are chicks, they're babies. Adult chickens are obviously quite sexually dimorphic. There's no reason for animals so far away from sexual maturity to display any significant degree of sexual dimorphism. You wouldn't really be able to tell the gender of pre-pubescent children apart without social factors like clothing choice and hairstyles either.
Secondly humans are very sight oriented, most animals aren't. They'll identify each other by sound or smell, that's why e.g. dogs smell each other's asses all the time. A male and female dog seem near identical to us but are probably very distinct to other dogs.
Also sexual dimorphism usually isn't for the purpose of identification, generally it's a reflection of the animal's lifestyle. Bucks don't have antlers to distinguish them from does, they have them for fighting other bucks. Male anglerfish are tiny and parasitic because they live a totally different lifestyle to the females, not because they need to look different. Even for humans this is the case, all our sexual dimorphisms are originally for practical purposes (e.g. breasts for breastfeeding and wide hips for childbirth) that simply became more exaggerated over time due to sexual selection pressures.
