Once you're below that, the population is not able to maintain itself. This is what we've seen the past three to four years.

They are producing about one chick per pair and the number scientists have determined they need for the population to be stable is 1.24 per pair. What we're hoping for is that this is just a blip in the map and that populations will all recover. But before the populations all recover we have to be very vigilant.

Over the past 15 years, the human population around Lake Naivasha has gone from tens of thousand of people to hundreds of thousand of people,

We looked back and this was the best year in the past three or four years.

This is the second top-10 criminal caught in Juarez in the past seven years.

The coolest thing I've gotten to do in the past few years is guest star on Sesame Street.