Experiment

Experiments can be found in the Experiment Cave, which can be accessed during Creature of Fenkenstrain quest. Completing the whole quest is not required to kill them, as you can simply push the farthest memorial from the castle and you will enter finding quite a few of them.

The level 25 experiments are the Sheepdog (top of the picture) and the Spiderman (middle of the picture). These experiments' respawn time is approximately 50 seconds. There are seven Experiment spawns in the Experiment cave, four Sheepdogs and three Spidermen.

The level 51 experiment is the Horse-human (bottom of the picture) and may only be killed once (unless you drop the cavern key obtained by killing it) during the Creature of Fenkenstrain quest. It is significantly stronger than the level 25 experiments, with a max hit of 70.

The level 25 versions' high HP, combined with their weak attack and defence, have made them popular for combat training, particularly among lower-level players. Experiments are the best NPC's to train on for level 1 defence pures.

They give 400.5 experience in the combat skill you're training, or 801 with sacred clay gear per kill. (Not including Magic, Dwarven Multicannons and Salamanders.)

100% drops

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Other drops

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Trivia

 * The Sheepdog may refer to the saying "A wolf in sheep's clothing", or possibly a sheep dog.
 * Spiderman might be a reference to Spider-Man. It also closely resembles one of the mutant toys from the Pixar film Toy Story.
 * When calculating combat level the only way this creature can have combat level 25 and 1000 LP, is if all of its other combat statistics are 1. This is reasonable as they have bad defence, rarely hit and have a max hit of 19.This is however dependant on whether RuneScape monsters without armour use the same combat calculating methods as players, and whether unofficial calculators are precisely accurate.
 * Despite being half-dog and half-sheep, the attack sound for the Sheepdog is the same as any normal wolf rather than a sheep or ram. However, this makes sense as it has the head of a wolf and would therefore make a wolf's sounds when attacking.
 * When attempting to kill the level 51 Horseshe with a cavern key in the inventory, a message appears saying: "You don't have the heart to kill the poor creature again."
 * The heads and bodies of the experiments still have the old graphics.
 * Even though the experiments are crossed between two monsters of different races, like sheep and wolf, they still drop regular bones.
 * The head of the Spiderman appears to be the default head of a male player-character when creating one during the old tutorial.
 * The Spiderman has a glitch where when walking on hills, part of its legs will seem to not be there.
 * It seems that crush type attacks are more effective against the spiderman, and slash attacks against the sheepdog.
 * Oddly enough, although the level 51 Experiment is a human/horse, there are no horses in Runescape.