Controlled experimentation is the next step to our survival. Genetic enhancement is a reality and is becoming more commercial every year. Kevlar, a material to protect our soldier and police, is in fact a product of genetic modification of spiders and goats. The trademarked GloFish , though a far less socially important modification, is a whimsical display of genetic potential. And as a last example I present the "fish tomato", the hybrid of a tomato and a winter flounder. Though this example did not come to fruition, the potential would be frost-resistant produce.
Hybrid human cloning with another species seems like a nicer way of describing human vivisection. It's unnecessary, cruel and could end up with disastrous results. I believe in progress, but this seems like progress for the sake of experimentation and not progress for the sake of something good. There's no known benefit to this, so why bother?
How many times, in the past, has something been declared safe, and then found to cause serious problems? Thalidomide was given to women to prevent morning sickness, and then found to cause very serious birth defects. How many scientists working on the Manhattan project died of cancer, because they were not able to predict what exposure to radiation would do to the human body. If scientists are not able to accurately predict risks, then they should not be doing something as risky as cloning anything, much less anything to do with human beings.
As human beings we have a moral obligation to be concerned about the quality of life of every living creature. Hybrid human beings created with other species would be nothing more than freak-show attractions. Any scientist who chose to engage in these kinds of experiments would be engaging in highly unethical behavior and should be at risk of prosecution by the appropriate authorities.