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One of the features of Animal crossing is digging up fossils. On the DS version, you may take the fossils directly to Blathers Barn-Owl and he will identify them right there and then, which makes it much easier.

But, on the Game Cube version, you have to send the fossils three per day via the mail.

I have a list here of the dinosaurs you can find on the Game Cube version and the pieces you need to complete the collection.

Stegosaurus

Skull - 5000 bells
Torso - 4500 bells
Tail - 4000 bells

This dinosaur is worth 13, 500 bells.

Apatosaurus

Skull - 5000
Torso - 4500
Tail - 4000

This dinosaur is worth 13, 500 bells.

T - Rex

Skull - 6000
Torso - 5500
Tail - 5000

This dinosaur is worth 16, 500 bells

Triceratops

Skull -
Torso -
Tail -

Plesiosaurus

Skull -
Neck -
Torso -

Pteranadon

Left wing - 4500
Right wing - 4500
Skull - 5000

This dinosaur is worth 14, 000

Mammoth

Skull -
Torso - 2500

Yes, you need only two pieces for the Mammoth.

Ammonite - 1100
Trilobite - 1300
Track - 1000
Egg - 1400
Amber - 1200

These last 5 are individual pieces that you can collect.

Notice that some of these come with their prices in case you get extra and you are in dire need for bells for debt payments.