The osteohistology (bone microstructure) of fossil animals is one of the most powerful avenues for investigating the biology and ecology of extinct vertebrates. Information gained from studying the bone histology of living animals helps us to understand the patterns seen in fossil hard tissues. In this way, osteohistology can be used as a proxy for inferring aspects of the life history of extinct vertebrates, including growth rates and patterns, ontogenetic stages, biomechanical adaptations to specific habitats and the effects of dramatic environmental perturbation on growth. I use osteohistology to assess the effect of environment and lifestyle on vertebrate life history. 

I find bone histology fascinating because it unlocks the hidden stories preserved in fossilized bones, providing a unique window into the lives of ancient animals. By studying bone microstructure, we can uncover how extinct vertebrates grew, adapted to their environments, and responded to significant ecological challenges.

This image was taken in polarized light with a lambda compensator. The different colours indicate different orientations of the collagen fibres in the bone. 

The parallels with living animals make osteohistology particularly compelling—it bridges the gap between the past and present, showing how life has evolved and adapted over millions of years. This approach offers insights into growth rates, life stages, and biomechanical innovations that allowed species to thrive in their environments, even amid dramatic changes like mass extinctions.

For those curious about the intricate interplay between biology, environment, and evolution, osteohistology provides a tangible connection to ancient ecosystems, helping us understand how organisms lived, survived, and sometimes perished. It's like piecing together a biological puzzle that informs not only the past but also our understanding of life today.