Picture of Goat
Goats are mammals, as are human beings (man).   The genetic code for man is longer than that for goats, though, and contains some 700 volumes each holding 1000 pages of information.   Each kind of animal, whether mammal, reptile, bird, or insect can produce tremendous variety by virtue of its DNA, so that it is not difficult to see how the whole human family was produced from a single human pair.   But no kind has ever been known to produce something other than its own kind (Genesis 1:24).