Apes can remember friends they haven't seen for over 25 years, a new study shows. That's longer than a dolphin's memory.

• Scientists set up a screen at sanctuaries for great apes and showed them pictures of other apes. 
• They found they looked at photos of apes they used to know longer than random apes. 
• This could mean that the apes have memories of other monkeys going back as much as 25 years. 

After a long day, these great apes like to sit down, have some juice, and admire pictures of their old friends.