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Seahorses swim upright, and they do it poorly: they are the slowest moving fish in the world with a top speed of about 5 ft (1.5 m) per hour! Slowest Animals In The World: Seahorse (source: Nick Hobgood). 8. Gila Monster â The Gila monster is a heavy slow moving lizard.iant Tortoise â The giant tortoise is the worldâs slowest reptile and one of the slowest animals in the world. But with a life span of 190 years, heâs not in a rush. And besides, youâd move slow too if you weigh as much as 300 kg (660 lbs). Slowest Animals In The World: Giant Tortoise (source: wiki).
Slowest Animals in the World. 1  1. The Sloth: 0.15 mph. 2  2. The Snail: 0.03 mph. 3  3. Starfish. 4  4. Giant Tortoise: 0.19 mph. 5  5. The Dust Spider: 1.17 mph. 6  6. The Sea Horse: 0.001 mph. 7  7. American Woodcock: 5 mph.