Ammonite Crabs can be found on the most coastal areas and the most northern beaches of Fossil Island.
Ammonite Crabs cannot be attacked by dwarf cannon.
Drops
Weapons
Item Quantity Rarity GE market price 
Bronze pickaxe 1 Common 67
Iron pickaxe 1 Common 24
Bronze axe 1 Uncommon 13
Runes and talisman
Item Quantity Rarity GE market price
Fire rune 7 Common 35
Nature rune 4 Uncommon 868
Chaos rune 1 Rare 89
Others
Template:Unidentified lagre fossilItem Quantity Rarity GE market price
Numulite 2–28 Common 40–560
Oyster 1–2 Common 86–172
Seaweed 1–5 Common 45–225
Oyster pearl 1 Common 108
Empty oyster 1 Common Not sold
Spinach roll 1 Uncommon Not sold
Knife 1 Uncommon 98
Opal bolt tips 5 Uncommon 40
Iron ore 1 Uncommon 173
Coal 2 Uncommon 324
Copper ore 3 Uncommon 285
Tin ore 3 Uncommon 285
Fishing bait 1–10 Uncommon 4–40
Unidentified medium fossil 1 Rare Not sold
Unidentified small fossil 1 Rare Not sold
Calcite 1 Rare 20
Pyrophosphite 1 Rare 71
Seaweed spore 1 Rare 964
Clue scroll (easy) 1 Rare Not sold
Volcanic ash 1 Rare 68
Rare drop table
In addition to the drops above, this monster also has access to the rare drop table.
Show/hide rare drop table Item Quantity Rarity GE market price
Coins 3,000 Common Not sold
Loop half of key 1 Common 10,307
Tooth half of key 1 Common 10,840
Chaos talisman 1 Common 505
Uncut sapphire 1 Common 455
Uncut emerald 1 Uncommon 679
Uncut ruby 1 Uncommon 1,249
Nature talisman 1 Uncommon 744
Steel arrow 150 Uncommon 4,800
Rune arrow 42 Uncommon 2,940
Rune javelin 5 Uncommon 875
Adamant javelin 20 Uncommon 1,220
Runite bar 1 Uncommon 12,368
Nature rune 67 Uncommon 14,539
Law rune 45 Uncommon 7,470
Death rune 45 Uncommon 9,135
Rune battleaxe 1 Uncommon 24,487
Rune 2h sword 1 Uncommon 37,758
Rune sq shield 1 Uncommon 22,459
Silver ore 100 (noted) Uncommon 7,000
Dragonstone 1 Uncommon 11,932
Uncut diamond 1 Rare 2,627
Dragon med helm 1 Rare 58,488
Rune kiteshield 1 Rare 32,015
Rune spear 1 Rare 11,933
Shield left half 1 Rare 65,697
Dragon spear 1 Rare 37,226
Trivia
- The crab's examine references Twitch Plays Pokémon, where users controlled a game of Pokemon Red through commands sent in the Twitch chat. The "player" choice the Helix Fossil item, and "praise helix" became an inside joke among the community.