In the related articles, there’s a link to the Hamster zona-free ovum test where this snippet lies:

Although medical professionals often present the procedure as unable to create an embryo,[5] these claims are not technically correct. If the human sperm succeeds in penetrating the hamster egg, a hybrid embryo is indeed created, known as a humster.[6] These embryos are typically destroyed before they divide into two cells; were they left alone to divide, they would still be unviable.[7]