Prices may not be very accurate
Chickens
Can be found north of Lumbridge, Southeast of Falador, among other locations. Since Chickens only have 30 Life Points, they are relatively fast to kill, and their Feathers can be sold for 5-15gp each.
Cows
Can be found slightly northeast of Lumbridge, southeast of Falador, and in many other places. In non-member worlds, these locations are relatively crowded since their hides can be sold for 100-150gp each.
Minotaurs
Are found in the Stronghold of Security. They are killed for their iron arrow drops, which can be sold on the Runescape forums or World 1 for about 15 gp each.
Hill Giants
Are found west of the gate of the Tree Gnome Stronghold, and in Edgeville's Dungeon. They are easily killed when you are around 45 Combat, and you can sell their Big Bones for 300-400gp each.
Moss Giants
Can be found in Varrock Sewers and on Crandor Isle, an attachment to Karamja. The main reason they are killed are for their bones. Their Big Bones can be sold for 300-400gp each.
Fire Giants
Can be found in the Waterfall Dungeon and the Wilderness Fire Giant Dungeon, and are stronger than the other giants. Instead of killing them for their bones, they are killed for their Rune Scimitar, and Dragon Drops. Also, they drop Fire Battlestaffs which can be High-Alched using Magic for 9,300gp.
Aviansies
Can be found in the God Wars Dungeon. They drop many Adamantite Bars, Rune Daggers, and Rune Limbs. They are one of the best monsters to kill for money. By wearing a symbol from the god, Armadyl, they will be non-aggressive to you.
Lesser Demons
Can be found under the Karamja Volcano. They are mainly killed for their Rune Medium Helm drops, which can be High-Alched for 11,520gp.
Greater Demons
Can be found in the Brimhaven Dungeon and at Gu'Tanoth's Dungeon. To kill Greater Demons at Brimhaven, take 875gp, a Machete, a Rune Axe (hatchet), the best armor and food you have, as well as a way to teleport out of the dungeon. Head through the dungeon until you see Moss Giants, and then climb the stairs to get to the area with Greater Demons and Wild Dogs.
Greater Demons are killed for Level 3 Clue Scrolls and Rune Full Helms. If you also pick up the coins they drop you can easily gain a few thousand coins. The Rune Full Helm drops can be sold for 20,000-30,000gp each.
Snakes
You can kill the snakes to the north of Mos Le'Harmless. They drop Snake Hides which can be sold for around 2,000 gp each.
Crawling Hands
Require a Slayer level of 5, and the main reason to kill these is the fact that they drop colored gloves which can be easily sold on non-member worlds. Nearly anyone can kill them, and make at least 500gp off each set of Gloves.
Bloodvelds
Require a Slayer level of 50. It is recommended that you Range them, as there is a safe spot, or you can attack them with a Halberd, however the Halberds speed does not work with its benefits. Bloodvelds are killed for the Blood Runes they drop.
Jellies
Are found at the Fremennik Slayer Caves. They use melee style attacks with a magic basing. In other words, they attack melee style, but you will want to wear Dragonhide Armor for protection as their attacks are magic based. They are primarily killed for coins (which if you pick up all the coins they drop, can add up to a few thousand), Rune Full Helms, and Level 3 Clue Scrolls.
Dust Devils
Require a Slayer level of 65, and are found in the Smokey Well. You need a Facemask to protect against the smoke which acts as poison. Dust Devils are primarily killed for their rare Dragon Chainbody drop which occurs 1 in a 10,000-16,000 chance range. It is recommended to either range them using Safe Spots, or Hally them, as they can deal up to 8 damage. Dragon Chainbodies can be sold for 10,000,000 gp each.
Gargoyles
Require a Slayer level of 75 and are located at the Canifis Slayer Tower. In order to kill them, you need a Rock Hammer, which is used on them when their health is low. Gargoyles are primarily killed for their Granite Maul drop which can be sold for about 30,000gp.
Nechryaels
Require a Slayer level of 80. They are also found at Canifis Slayer Tower, and are primarily killed for Rune Boot drops, which can be sold for 25k.
Abyssal Demons
Can be found at the top of the Canifis Slayer Tower or in the Alternate Abyss which is reached by using the Fairy Ring's coordinates ALR. Abyssal Demons require a Slayer level of 85, and they are primarily killed for their Abyssal Whip drop which can be sold for 1,400,000gp.
Green Dragons
Are found in the Wilderness and are mainly killed for Green Dragonhides which sell for about 1,600-1,700gp, and Dragon Bones which sell for 1,500-1,600gp each. For more Dragon hunting information, see the Dragon Hunting guide.
Blue Dragons
Are found in the Taverley Dungeon, the Heroes' Guild, and the Ogre Enclave. There is only on in the Heroes' Guild, but it's in a fenced off area and can be ranged or maged. Blue Dragons drop Blue Dragonhide which sell for 1,700-2,000gp each. They also drop Dragon Bones which can sell for 1,500-1,600gp each.
Black Dragons
Are found in either Taverley Dungeon or the Evil Chicken's Lair. They are easily ranged. They drop Black Dragonhides which sell for 3,300-3,600 gp each. They also drop the elusive Draconic Visage. Steel Dragons, Iron Dragons, Mithril Dragons and Skeletal Wyverns also drop the visage, but it is a very rare drop.
King Black Dragon
Is the second strongest dragons in RuneScape, and due to this, drop some of the best items. Their drops include Dragon Medium Helms which sell for 75,000 gp, Dragonstones which sell for 50,000-60,000gp, Black Dragonhide which sells for 2,500-4,000gp, Dragon Bones which sell for 1,500-1,600gp each, and Level 3 Clue Scrolls. For more information on killing this dragon, see the King Black Dragon Hunting guide.
Kalphite Queen
Lives in the Kalphite Lair and might drop a Dragon Medium Helm which sells for 68,000 gp, Dragon 2h Sword which can sell for 1,150,000-1,300,000gp, or a Dragon chainbody which sells for around 5,000,000gp. For more information on how to kill the Kalphite Queen, please see the Kalphite Queen Hunting guide.
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