Koshka, a 19-year-old Amur, or Siberian, tiger, was euthanized this week after her health declined due to age, a news release ...

Lions and tigers are two different species. They look different, they have different lifestyles, they vocalize differently, and they generally live on different continents. Yet when they are ...

A species is a group of organisms that interbreed to produce fertile offspring. Selective breeding is when organisms are deliberately bred so their offspring have the desirable characteristics.