<P> Biologist E.O. Wilson has advocated the eradication of several species of mosquito, including malaria vector Anopheles gambiae . Wilson stated, "I'm talking about a very small number of species that have co-evolved with us and are preying on humans, so it would certainly be acceptable to remove them . I believe it's just common sense ." </P> <P> Some, such as Harvard geneticist George M. Church, believe that ongoing technological advances will let us "bring back to life" an extinct species by cloning, using DNA from the remains of that species . Proposed targets for cloning include the mammoth, the thylacine, and the Pyrenean ibex . For this to succeed, enough individuals would have to be cloned, from the DNA of different individuals (in the case of sexually reproducing organisms) to create a viable population . Though bioethical and philosophical objections have been raised, the cloning of extinct creatures seems theoretically possible . </P> <P> In 2003, scientists tried to clone the extinct Pyrenean ibex (C. p. pyrenaica). This attempt failed: of the 285 embryos reconstructed, 54 were transferred to 12 mountain goats and mountain goat - domestic goat hybrids, but only two survived the initial two months of gestation before they too died . In 2009, a second attempt was made to clone the Pyrenean ibex: one clone was born alive, but died seven minutes later, due to physical defects in the lungs . </P>

Which process of evolution does not change the total number of species