There is no conclusive evidence to suggest that an extraterrestrial impact triggered the extinction of ice-age animals. The commonly accepted explanation is that the extinction event, known as the Pleistocene megafauna extinction, was primarily driven by climate change and human activity.

Here are the key factors believed to have contributed to the extinction of ice-age animals:

1. Climate Change: The Earth experienced significant fluctuations in climate during the Pleistocene epoch, which included periods of intense cold (glacial periods) and warmer periods (interglacial periods). These changes in climate heavily influenced the availability of habitats, food sources, and water for large mammals. As the climate shifted rapidly, many species were unable to adapt and perished.

2. Human Activity: The arrival of humans in various regions marked the onset of hunting, overhunting, and habitat alteration, which played a crucial role in the decline and extinction of numerous ice-age animals. Humans competed with animals for resources and actively hunted species for survival, leading to significant population reductions and eventual extinction.

3. Disease and Epidemics: The spread of diseases or epidemics within vulnerable animal populations may have also contributed to their decline during this period. However, the exact role of diseases in the megafauna extinction is still debated and not fully understood.

While some research has proposed the possibility of extraterrestrial impacts around the time of the extinction event, no substantial evidence directly links such impacts to the disappearance of ice-age species. The current scientific consensus focuses on climate change and human factors as the primary drivers of the Pleistocene megafauna extinction.