Publications

Visual sensory signals dominate tactile cues during docked feeding in hummingbirds

Animals living in and interacting with natural environments must monitor and respond to changing conditions and unpredictable …

Acute restraint stress alters wheel-running behavior immediately following stress and up to 20 hours later in house mice

In vertebrates, acute stressors-although short in duration-can influence physiology and behavior over a longer time course, which might …

Hummingbirds control turning velocity using body orientation and turning radius using asymmetrical wingbeat kinematics

Turning in flight requires reorientation of force, which birds, bats and insects accomplish either by shifting body position and total …

Challenges and advances in the study of pterosaur flight

Challenges with trying to reconstruct and interpret flight in extinct archosaurs

Membrane muscle function in the compliant wings of bats

Unlike flapping birds and insects, bats possess membrane wings that are more similar to many gliding mammals. The vast majority of the …

Wingbeat kinematics and motor control of yaw turns in Anna’s hummingbirds (Calypte anna)

The biomechanical and neuromuscular mechanisms used by different animals to generate turns in flight are highly variable. Body size and …

Sex differences in cannabinoid receptor-1 (CB1) pharmacology in mice selectively bred for high voluntary wheel-running behavior

The endocannabinoid system (ECS) is involved in regulation of various physiological functions, including locomotion, antinociception, …

How to run far: multiple solutions and sex-specific responses to selective breeding for high voluntary activity levels

The response to uniform selection may occur in alternate ways that result in similar performance. We tested for multiple adaptive …

The effect of body size on the wing movements of pteropodid bats, with insights into thrust and lift production

In this study we compared the wing kinematics of 27 bats representing six pteropodid species ranging more than 40 times in body mass …

Functional significance of genetic variation underlying limb bone diaphyseal structure

Limb bone diaphyseal structure is frequently used to infer hominin activity levels from skeletal remains, an approach based on the …

Erythropoietin elevates VO2,max but not voluntary wheel running in mice

Voluntary activity is a complex trait, comprising both behavioral (motivation, reward) and anatomical/physiological (ability) elements. …

Variation in within-bone stiffness measured by nanoindentation in mice bred for high levels of voluntary wheel running

The hierarchical structure of bone, involving micro-scale organization and interaction of material components, is a critical …

Day-to-day variability in voluntary wheel running among genetically differentiated lines of mice that vary in activity level

This study examined the day-to-day variability in voluntary wheel-running behavior among three genetically distinct lines of young male …

Behavioral despair and home-cage activity in mice with chronically elevated baseline corticosterone concentrations

Dysfunction of the hypothalamic-pituitary-adrenal axis resulting in elevated baseline glucocorticoid concentrations is a hallmark of …

Morphometrics of the avian small intestine compared with that of nonflying mammals: a phylogenetic approach

Flying animals may experience a selective constraint on gut volume because the energetic cost of flight increases and maneuverability …

Phenotypic effects of the 'mini-muscle' allele in a large HR x C57BL/6J mouse backcross

From outbred Hsd:ICR mice, we selectively bred 4 replicate lines for high running (High-Runner [HR] lines) on wheels while maintaining …

Selective breeding as a tool to probe skeletal response to high voluntary locomotor activity in mice

We present a novel mouse-model for the study of skeletal structure and evolution, based on selective breeding for high levels of …

Mosaicism, modules, and the evolution of birds: results from a Bayesian approach to the study of morphological evolution using discrete character data

The study of morphological evolution after the inferred origin of active flight homologous with that in Aves has historically been …

Biomechanics of the bat limb skeleton: scaling, material properties and mechanics

BACKGROUND/AIMS: Wing skeletons of bats are uniquely specialized for flight, reflecting both evolutionary history and the need to …

Direct measurements of the kinematics and dynamics of bat flight

Experimental measurements and analysis of the flight of bats are presented, including kinematic analysis of high-speed stereo …

Bird evolution

Current perspective on avian evolution

The morphological basis of hallucal orientation in extant birds

The perching foot of living birds is commonly characterized by a reversed or opposable digit I (hallux). Primitively, the hallux of …

Theropod forelimb design and evolution

We examined the relationship between forelimb design and function across the 230-million-year history of theropod evolution. Forelimb …

Three-dimensional preservation of foot movements in Triassic theropod dinosaurs

Dinosaur footprints have been used extensively as biostratigraphic markers, environmental indicators, measures of faunal diversity and …

Bipedalism, flight, and the evolution of theropod locomotor diversity

Limb disparity in thropods across the transition to avian flight.