Zoo Sights can include a variety of different sights, such as ANIMALS, PENS, and CAGES. ANIMALS are typically the most popular sight at a zoo, with many different species of ANIMALS living in enclosures for visitors to observe. PENS are also a common sight at zoos, providing a more intimate experience for visitors to get up close and personal with the ANIMALS. Finally, CAGES are also a common sight at zoos, providing a safe and secure environment for the ANIMALS to live in.