adding fact; closes #267 (#268)

Co-authored-by: mgwalker <mgwalker@users.noreply.github.com>

giraffes.json

@@ -96,5 +96,6 @@
   "There are giraffes with dwarfism. They have horse-sized legs and horse-sized bodies, but giraffe-sized necks. They're still 9 feet tall, too. Even a short giraffe is taller than you.",
   "Giraffes do not eat each other without a very good reason.",
   "A giraffe will never win the Boston Marathon because they're sprinters, not long-distance runners. But they can run nearly 40 mph, so they'd at least get a heck of a head start.",
-  "Sometimes giraffes don't have spots."
+  "Sometimes giraffes don't have spots.",
+  "Giraffes do not climb trees because they're afraid of heights."
 ]