Sea Turtles Part 2
Loggerhead Turtle
• Loggerheads can grow
up to 350 lbs,
between 31-42 ins.
• They can be identified
by their large head,
reddish brown
carapace (top), and
dull brown plastron
(bottom).
Hawksbill Turtle
• The beautiful shell of
Hawksbill turtles is
often used for jewelry
Olive Ridley
• This is one of the
smallest sea turtles,
weighing only 100lbs.
It is also one of the
most numerous
species of sea turtle.
• It is named Olive
Ridley because of the
olive coloring.
Kemp’s Ridley
• Kemp’s Ridley is the most
endangered species, as
well as the smallest: only
grows to 24-28 ins and 77100lbs.
• They are olive green in
color.
• They only nest on one
beach in the world, in
Rancho Nuevo, Mexico.
Leatherback
• Can dive the deepest
and travel the furthest
of any other turtle.
• They have tough
leathery skin covering
their back.
Leatherbacks
• Largest sea turtle, up
to 7 ft long, 1200lbs.
• Instead of a solid shell
they have bones in
their skin that form 5
ridges.
Navigation
Navigation
• Navigation is finding
the way from one
location to another.
• What are some ways
that people can
navigate?
Navigation
• 1. Compass
• 2. Stars
• 3. Position of Moon and
Sun
• 4. Maps
• 5. Landmarks
• What are some ways that
sea turtles may navigate
in the water and on
land?
Navigation
•
•
•
•
Sight
Position of the moon
Wave direction
Internal compass
(turtles that we know
use this: loggerhead
and leatherback)
Navigation
• So how do you think
baby turtles navigate
from the nest to the
ocean?
Navigation
• 1. Move away from
silhouettes at the top of
the beach
• 2. Orient themselves
toward the brightest light
(moon on water in low
populated beaches)
• They can sense the
direction of waves when
in the water
• Some use a magnetic
compass.
Navigation
• What are some
reasons a turtle might
have to navigate in the
ocean?
• How far do you think
turtles may migrate?
Navigation
•
•
•
•
They migrate to find:
food
mates
and beaches to nest
on
Navigation
• Some turtles migrate
over 2600 km but
most will only travel
1000 km.