Imps: 

Imps are small creatures that are found in Great Britain and Ireland. They are able to excel at pranks. They have a form of humour similar towards a little kid and enjoy tripping people. The diet of an Imp includes leaves, algae and water bugs. When a imp gives birth, they share their humour. Studies show that imp humour serves as both magical inhancement and amusement. Some think that Imps may have similar magic to House Elves. Imps are sometimes kept in people's garden for security, as they'll prank intruders. In terms of breeding imps, having either a river or pond is necessary. 

Jobberknolls: 

Jobberknolls are small blue birds which are found in North America and Northen Europe. Jobberknolls are silent until their death, when they recite everything backwards. Their death is traumatic, so using the silencing charm is recommended. Jobberknolls live 10-15 years on average and can die from a variety of things. They lay eggs and mate for life. Jobberknolls are used for their feathers, as they can be used in memory and truth potions due to their genetic ability. They require large spaces when being kept. Feathers should be collected after Jobberknolls shed them.