Possible Clues:

• Inhabitants of central African rain forests
• Ok, Pa is wrong about the giraffe-type animals
• They look like short-necked giraffes
• Seen in book, apish animals
• Sounds like beastly types associated with The Strypes related to those with high neckline
• Giraffelike animals
• So-called 'African unicorns'
• Giraffe kin
• Zebra giraffes
• In part, mistook a pisanosaurus for close relatives of the giraffe