A biologist has come to the defense of Harry Potter author J.K. Rowling after she made comments referencing biological sex as the standard for how a man or woman is defined.

Atheist and biologist Richard Dawkins drew upon his years of research and said that there are only two biological sexes.

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“There are two sexes. You can talk about gender if you wish,” Dawkins told Piers Morgan Uncensored. “I’m not interested in that. As a biologist, there are two sexes, and that’s all there is to it.”

Rowling has faced backlash following a series of tweets that began after she blasted gender-inclusive language of “people who menstruate.” In January, the author drew additional ire when she told critics “real misogyny” is found in men telling women how to behave, think, or feel.

Dawkins called those who have threatened to cancel Rowling over her comments bullies.

“We’ve seen the way J.K. Rowling has been bullied, the way Kathleen Stock has been bullied,” Dawkins said, also referencing the British professor who questioned the authenticity of transgender women claiming to be women. “They’ve stood up to it. But it’s very upsetting, the way this tiny minority of people has managed to capture the discourse and to really talk errant nonsense.”

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Dawkins was stripped of a humanist award in 2021 because of a tweet in support of discussing the legitimacy of activists’ demands to change language and biological definitions.

“Sex really is binary, and therefore, it’s certainly worth discussing that odd anomaly, which I pointed out in that tweet,” Dawkins said in defense of his comments.