find a species in the animal kingdom that does not strictly adhere to two biological sexes. (CANNOT BE CLOWNFISH, OR SPOTTED HYENA)

Tell me:

1. What that species is.

2. What makes their biological sex "not binary" (Do they switch sexes in their life span? Do the males in the species get pregnant? What stands out to you about this species?)

3. How does learning about this species shape your understanding of gender as a social construct vs. biological sex?

4. Cite your source! it should be a credible source (from a science foundation, university, museum, etc.--no Wikipedia).