Monster Claws in The Legend of Zelda Skyward Sword are essential for upgrading equipment and key items. To obtain Monster Claws in Skyward Sword, you must eliminate a series of specific and very special enemies. If you can defeat these monsters in their specific locations, they will definitely drop monster claws for you to use.
First of all, if you defeat Keese, you will get a Monster Claw. First you have to find them at Skyloft, Waterfall Cave, Lanayru Mining Facility, Faron Woods and Skyview Temple. There is also Guay in Faron Woods, if you defeat them, they will drop monster claws. You can also find them in The Sky. Unsurprisingly, this goes beyond the cloud barrier. Go there and defeat the enemy, the monster claw will be yours.
The next creature is Walltula, which can be found in Faron Woods, Thunderhead, and Skyview Temple. Defeat Fire Keese in Eldin Volcano or Thunder Keese in Lanayru Desert, to get monster claws.
This is where the monster claws are found in Zelda: Skyward Sword HD. You will not be able to find them in any other location. Claws are particularly useful for upgrading your attack and defense equipment, such as iron bows and Fortified Shield.
Obtaining Monster Claws will make your game easier, so be sure to let them save yourself some trouble in the future.