These are the most frequently used words in this book.
ago
air
along
ancestors
animals
another
away
baleen
between
biologists
body
bones
brain
branches
called
came
cells
change
come
cuvier
darwin
days
different
dolphins
down
early
ears
eggs
embryo
even
evolution
evolved
far
feet
few
find
fins
first
fish
form
fossils
found
genes
get
gingerich
hand
head
jaw
kind
land
later
legs
life
limbs
lineages
little
living
long
look
looked
mammals
may
mesonychids
might
million
muscles
museum
new
now
ocean
once
owen
own
paleontologists
part
place
reptiles
rock
sea
see
set
side
skull
species
still
tail
take
teeth
tetrapods
thought
three
time
tree
two
use
water
whales
work
years
yet