Freezing temperatures in eastern Bolivia (normally above 68 degrees Fahrenheit) killed millions of fish in three major rivers, and thefreeze was viewed as an environmental catastrophe.
Genes are being added only one at a time, rather than wholesale, and though such genes are usually from other species (there has been a lot of squeamishness about putting anti-freeze genes from fish into plants, for example), the genes of different creatures vary less than those creatures' outward forms might indicate.
