Druid Wild Shape

The 5E rules says the druid can assume the shape of a beast they've seen before. In addition to small, normal animals (squirrels, birds, rabbits, etc) I am taking "beast" to mean the category of creatures which are mundane (lions, tigers, sharks, hawks) and non-magical monsters (giant spiders, giant eagles) which the rules refer to as beasts. Such as:

Challenge Rating 0
Baboon
Badger
Bat
Cat
Crab
Deer
Eagle
Frog
Giant fire beetle
Goat
Hawk
Hyena
Jackal
Lizard
Octopus
Owl
Quipper
Rat
Raven
Scorpion
Sea horse
Spider
Vulture
Weasel

Challenge Rating 1/8
Blood hawk
Camel
Flying snake
Giant crab
Giant rat
Giant weasel
Mastiff
Mule
Poisonous snake
Pony
Stirge

Challenge Rating 1/4
Axe beak
Boar
Constrictor snake
Draft horse
Elk
Giant badger
Giant bat
Giant centipede
Giant frog
Giant lizard
Giant owl
Giant poisonous snake
Giant wolf spider
Panther
Pteranodon
Riding horse
Wolf

Challenge Rating 1/2
Ape
Black bear
Crocodile
Giant goat
Giant sea horse
Giant wasp
Reef shark
Warhorse

Challenge Rating 1
Brown bear
Dire wolf
Giant eagle
Giant hyena
Giant octopus
Giant spider
Giant toad
Giant vulture
Lion
Tiger

Challenge Rating 2
Giant boar
Giant constrictor snake
Giant elk
Polar bear
Rhinoceros

Challenge Rating 3
Giant scorpion
Killer whale

Challenge Rating 4
Elephant

Challenge Rating 5
Giant crocodile
Giant shark