Final answer:
An animal with thick fur is most likely not found in a savanna due to the warm climate of the ecosystem, which favors animals with adaptations suited for warmer temperatures like grazing, long legs, and the ability to burrow.
Step-by-step explanation:
The organism that is most likely not found in a savanna ecosystem is an animal with thick fur. Savannas are characterized by a warm climate, and animals with thick fur are typically adapted to cold environments. Therefore, the presence of thick fur would be disadvantageous in the hot savanna climate.
On the contrary, animals that graze, such as zebras and wildebeests, animals with long legs like the giraffe, and animals that burrow to escape the heat or predators, are all well-suited to the conditions in a savanna. These adaptations help them to survive in an environment where resources such as food and shade are scattered and predation pressure can be high.
In summary, the savanna's warm climate and grassland ecosystem support a variety of organisms such as grazers and burrowers, but it is not a conducive environment for animals with adaptations for cold climates, such as thick fur.