Florida Museum field biologist Johanna Imhoff prepares to measure and tag
a bonnethead shark as biologist Jason Romine pulls in a 600-foot gill net.
Elephant populations continue to dwindle in Tanzania.
With proper safeguards, water currents can be harnessed out of sight.
Barely pulled back from the brink of extinction, California condors are still being poisoned by lead-based ammunition.
Vulnerable everywhere in the wild, lions already face regional extinction.