below
surface
quite
unusual
creatures
seahorse
lizard
camouflage
enemies
t-shaped head
across
hammerhead
humans
opposite
comparison
umbrella-shaped
see-through
called
tentacles
different
shape
arms
varying
seems
grow
size
sting
hurt
even
kill
touch
stingray
another
flattened
tail
spike
inject
venom
lurks
bottom
dangerous
unwary
difficult
sandy floor
however
venomous
dolphins
whales
warm-blooded
mammals
communicate
learn
using
sounds
intelligent
learn
many tricks
captivity
said
lay