The prehistoric era spans a vast period of time, and different species of animals lived and went extinct under various circumstances. While it is challenging to pinpoint specific reasons for the starvation of prehistoric animals, there are several factors that scientists have studied to understand the potential causes. Here are some possible reasons:

1. Climate Change: Shifts in climate patterns, including temperature fluctuations and changes in precipitation, could have impacted the availability of food sources for prehistoric animals. Periods of drought or extreme cold may have led to the decline or loss of vegetation, leading to insufficient food supply.

2. Habitat Loss: Changes in landscapes, such as the disappearance of forests or the transformation of environments, could have resulted in the loss of suitable habitats and food sources for prehistoric animals. Geological events like volcanic eruptions, earthquakes, or the formation of new landmasses might have altered ecosystems, making it difficult for animals to find adequate sustenance.

3. Competition for Resources: Over time, the competition for food resources among prehistoric animals could have increased as populations grew or as new species evolved. If the available food supply was limited, certain species may have struggled to find enough food to sustain themselves, leading to starvation.

4. Disease and Parasites: Similar to modern-day animals, prehistoric animals were susceptible to diseases and parasitic infestations. Outbreaks of infectious diseases or the spread of parasites could have weakened populations and made it challenging for animals to find sufficient food, eventually leading to starvation.

5. Overhunting or Predation: In some cases, human hunting or predation by other animals might have played a role in the decline of certain prehistoric species. If animals were extensively hunted by early human populations or faced increased predation pressure, their populations could have dwindled, resulting in inadequate food availability and eventual starvation.

It is important to note that determining the exact causes of prehistoric animal starvation is challenging due to the limited fossil record and the complex interactions of various factors over vast periods of time. Scientists rely on fossil evidence, paleoclimatic reconstructions, and ecological models to develop hypotheses and understand the potential reasons behind the extinction of prehistoric animals.