Here’s your info:

https://youtube.com/watch?v=fpGqFUStcxc

10 minute crash course on sex, gender and trans people.

If you prefer reading over watching, here is a decent starting point:

https://en.wikipedia.org/wiki/Sex–gender_distinction

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Also, while… it often does not make too much sense to describe or speak of the gender of non human animals… as gender is very much a sociological role an individual plays within in a group, that is derived from but not wholly determined by their biological make up alone… and we cannot exactly interrogate animals and ask them precisely how their societies and their minds work…

There have been many observed instances of sexually male or female animals uh, going against type, you might say, and preferring to mate and/or cohabitate with their own sex of the same species, or just doing it with either easily observably different sex.

And we do know of many human societies that have had more complex views of, and language for genders, that goes beyond the typical male/female gender binary, throughout history, and possibly even into prehistory.

Here are some societies that are alive today, which have more than two genders:

https://www.britannica.com/list/6-cultures-that-recognize-more-than-two-genders

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Back to the biological realm, different kinds of sexual dimorphism and sexual variation exist in different kinds of creatures.

While rare (as within humanity), there are and have been observed and documented intersex animals.

Human people, persons, can also be born intersex, with something other than the typical XX or XY sexual chromosomes. As you can hopefully understand, given your current difficulty coming to terms with the concept of sex and gender being more than a binary… imagine actually being an intersex person, born into a society with many like you, who are eager to either force them into either category A or category B, both biologically and sociologically, when in fact they are neither.

Or, sometimes people can be born with the outer physical features that suggest one traditonal sex and gender to an outside observer, but with the hidden inner neurochemistry and hormonal/endocrine systems that significantly more strongly resemble the other traditional sex snd gender.

Or … something else, something inbetween, or just distinct.

Some animals are born with one sex, and if the environment has the right conditions, they’ll morph into a different sex.

Many plants have both the male and female sexual organs, they are hermaphrodites, or monoecious… while other plants are dioecious, split into basically sexually male plants and sexually female plants.

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In summary… the totality of possibilities that exist as a biological result of sex and sexual reproduction as a mode of perpetuating life, not just within humans, but within all living things… is vastly more expansive and complex than a simple binary.

If you’ve genuienly never heard of any of this before, yes, it can be quite confusing.

On the other side of that are people who know much of these things already, and are unfortunately often very wary of and beleaguered by, even hostile toward people who treat their existence as an illness, an aberration, a mistake.

Who would rather that they all either conform to simplistic tradition, or just cease to exist.

Trans people, gay lesbian queer people… we have a history of being genocided by Nazis (yes, literally), persecuted by religious zealots, disenfranchised by populist authoritarians, decried and insulted and targetted as minority groups … so we have a kind of collective hypervigilance about those who are disdainful or doubtful of our existence.

I hope that your curiosity to at least learn more about these topics is genuine, and I think it might be, given that you seem to still be trying to have this conversation here.