Currently, most GMOs are plants. Why do you think there are fewer genetically modified animals?

Because it is easier to genetically modify plants. Just put them next to each other and plants will breed.

because it is harder and would take more materials to genetically make more animals. there have been cases where they did make genetically modified animals but those were called cloning. it is also extremely dangerous because if they mess up they may create more of a danger than an animal.