Nature 101: Intelligent Animals you can pet (Classified w.r.t. Classes)

                    

1. Birds 
   1. Parrots
      
      • African Grey Parrot
      • Cockatoo
   2. Pigeons
   3. Owl
   4. Falcon
   5. Crows
      
      
2. Insects
   1. Ants
   2. Spider(s)
   3. Bees
      
      
      
3. Cephalopoda
   
   1. Squid
   2. Octopus
      
      
4. Rodents
   
   1. Squirrel
   2. Rat
      
      
5.  Mammals -
   
   1. Elephants 
   2. Raccoon
   3. Cat
   4. Horse
   5. Pig 
   6. Sheep
   7. Dogs (only dogs with high intelligence are listed)
      
      • Border Collie
      • Doberman Pinscher
      • Golden Retriever
      • Labrador Retriever
        
        
   8. Apes
      • Chimpanzees
      • Baboon
      • Rhesus Monkeys
      • Orangutans
        
        
   9. Marine Mammals
      
   • Gray Whale
   • Sea Lion
   • Dwarf Sperm Whale
   • Bottlenose Dolphins
     
     Note: Contrary to popular belief; the Killer Whale (Wild Orca) should not be pet as they are known to kill their trainers in captivity.