Answer : A Porpoise is lighter than a Sheep
The average weight of a Porpoise is 53 kg, (117 lbs) and the average weight of a Sheep is 100 kg, (220 lbs)
 
| Name | Name:Porpoise | Name:Sheep | 
| Weight | Weight:53 kg, (117 lbs) | Weight:100 kg, (220 lbs) | 
|  | * Harbor Porpoise - ranges from 45 to 60kg | * Domestic Sheep - ranges from 20 to 200kg | 
| Height | Height:n/a | Height:80 cm, (2 ft, 7.5 in ) | 
| Top Speed | Top Speed:23 kph, (14 mph) | Top Speed:40 kph, (25 mph) | 
| Lifespan in Wild (years) | Lifespan in Wild (years):15 | Lifespan in Wild (years):n/a | 
| Description | Description:Harbor Porpoise are among the smallest cetaceans in the ocean. It has small flippers and lives inshore, so is the best-studied of the cetaceans. Their loud puffing sounds make them easy to find. | Description:Domestic sheep are domesticated animals raised primarily for their wool and meat. They are grazers of grass and berries, and known for their thick white, grey, or black wool. | 
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