# What Factors Shape the Flyability in Bats?—The Perspective from Bat’s Wing Development

## TL;DR

This paper reviews how bat wings develop and how factors like genetics and environment shape their unique ability to fly.

## Contribution

The paper integrates developmental, physiological, and evolutionary perspectives to propose new approaches for studying bat flight capabilities.

## Key findings

- Bat wings develop from elongated finger bones and skin membranes, forming the basis for powered flight.
- Flight capabilities are influenced by genetic regulation, muscle dynamics, and environmental factors.
- The co-evolution of flight and echolocation remains an important area for future research.

## Abstract

Bats are the only mammals capable of true powered flight, a remarkable ability supported by their highly specialized wing structures and complex physiological regulation. Herein, flyability is defined as a comprehensive biological trait supporting bat-powered flight. This review synthesizes current advances in understanding the development of bat wings and flight capabilities, encompassing the evolution of wing morphology, flight-related muscle function, energy metabolism adaptations, and the developmental trajectory from embryonic to adult stages. We further discuss the co-evolutionary relationship between flight and echolocation, as well as the roles of genetic regulation, muscle dynamics, and environmental factors in shaping wing development. Existing research indicates that the molecular mechanisms underlying bat wing formation remain insufficiently understood, limiting our comprehension of the origins of mammalian flight and ecological adaptation strategies. This integrative analysis not only sheds light on the evolutionary mechanisms of flight but also provides theoretical foundations for species conservation and the design of bio-inspired aerial technologies.

Among mammals, bats are the only species capable of powered flight, which is made possible by their highly evolved wings. The wings of bats are highly specialized, composed of skin membranes that extend from their forelimbs, hindlimbs, and elongated finger bones, forming the structural foundation for flight. Previous research has extensively examined bat wings from various perspectives, including tissue embryology, structural morphology, and aerodynamics. These studies have focused on the origins of bat wings, their embryonic development, as well as the muscles and skeletal structures involved in flight, laying a crucial theoretical foundation for understanding the development and evolution of bat flight. In addition to structural aspects, physiological processes like the high metabolic rate, energy supply, and oxidative stress responses required for sustained bat flight have also been investigated. This review aims to explore various factors influencing the development of bat flight capabilities, with particular attention to the relationship between wing morphology and flight behavior, highlighting the importance of investigating bat flight capabilities within the context of echolocation calls development. From the perspective of bat wings, this review proposes an integrated analysis of related factors affecting the unique and intricate characteristics of bat flight capabilities, offering new perspectives and approaches for future studies in developmental and evolutionary biology.