Like many animals, until a child is about 18 months, they don’t understand that the image in the mirror is a reflection.
Magpies are one of the few animals that seems to pass the MSR test. The bird in this vidoe has a yellow sticker placed under it’s beak on the chest. It can only see the sticker in the mirror.
A little more in depth of Dr, GG. Gallup Jr. article and self recognition in chimpanzees:Nature magazine
Featherless Chickens
Researchers, led by Avigdor Cahaner bred the featherless chicken at the genetics faculty of the Rehovot Agronomy Institute, Tel Aviv, Israel.
50 years of breeding
Not genetically modified
Taste the same
Same nutritional value
Advantages:
Faster growth
Their meat is lower in fat
They are energy efficient and require less food to produce the same amount of meat
They can adapt better in hot climates
The breed is more ecofriendly, as there is no need for plucking, a process that contaminates large quantities of water with feathers and fat tissues.
Disadvantages
Hard time surviving in cool and cold areas
More prone to parasites, mosquitoes and sunburns
Males sometimes fail to mate,
as the feathers are required in certain mating rituals (flapping wings, showing them off etc.)
Females are routinely injured during mating
by the rooster’s nails and beak, as they have no feathers to protect their skin. For this reason, breeders commonly remove the male’s nails.
A number of other hairless, featherless animals:
Hairless guinea pigs called skinny pigs
Crossbreed of hairless lab animal and regular guinea pig created hairless mutation