There are plenty of fish in the sea -- and biologist Adam Summers wants to know about all of them. CBS News Correspondent Sam Litzinger has his story.

The manatee and monarch butterfly populations are making a comeback. Here's CBS News Correspondent Sam Litzinger with the story.

CBS News Correspondent Sam Litzinger discusses how the people of New Zealand are trying to get rid of invasive species.

Prison inmates are getting a taste of the outside world by training dogs who will go up for adoption. CBS News Correspondent Sam Litzinger has the story.

CBS News Correspondent Sam Litzinger discusses how researchers are "eavesdropping" on animals.

Researchers have learned that horses can differentiate a human's mood by their facial expressions. CBS News Correspondent Sam Litzinger has more.

Sam Litzinger gives the history of the dog-human connection, and explores a whole new genre of music -- songs for cows.

Sam Litzinger talks wolf dialects, and why a new species of tarantula takes its name from Johnny Cash.

CBS News Correspondent Sam Litzinger wonders if it will be possible to visit zoos in the future.

CBS News Correspondent Sam Litzinger reports on how birds of prey are being used to intercept hostile drones.