Hi, you're about to get smarter in just a few minutes with Curiosity Daily from Curiosity.com.

I'm Ashley Hamer.

And I'm Natalia Reagan.

Today you learn about Janandromorphs or animals that are born half male and half female,

then we'll talk to poker champion turn decision strategist Annie Duke about when it's best to go with

your gut.

Let's satisfy some curiosity.

A couple of months ago, researchers in Pennsylvania spotted a very odd bird.

On one side of its body, it had markings typical of a male on the other it looked like a female

the researchers immediately knew they were looking at a type of animal known as a bilateral

ganandromorph. These creatures don't just look half male, half female. That's what they really are.

Bilateral gendangomorphs are rare, but not impossibly so. One researcher estimated they account for between 1 in 10,000

and 1 in 1 million birds.

There are a ton of ways an individual can fall outside of the expectations for what a female or male is supposed to be like.

Hermaphrodites are probably the most well known. They typically have genitals with a mixture of male and female

characteristics, but in bilateral genitals with a mixture of male and female characteristics.

But in bilateral gendangomorphs,

the differences extend way past the private parts.

The bones, muscles, and in birds, feathers on the left side look entirely different from those on the right side.

Scientists aren't totally sure how it happens, but they have a theory.

See, biological sex, which is different than gender by the way, depends on an individual's particular

combo of sex chromosomes.

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