These systems rely on human beings to do the initial work of identifying the meanings of different animal behaviors (usually based on long observation of animals in various situations).

Each component of a cell has its own function. Animal and plant cells differ and they have similarities. Nucleus, cell membrane, cytoplasm and mitochondria are four cell components that are found ...

Here’s what happened next. From animal encounters to Chance Encounters, CNN Travel’s hit series about love and friendship is now a new CNN podcast. Host Francesca Street chronicles marvelous ...