This chapter briefly reviews what is known—and what remains to be understood—about
Grey parrot vocal learning. I review Greys' physical capacities—issues of auditory perception …

The voices of birds have always been a source of fascination. Nature's Music brings together
some of the world's experts on birdsong, to review the advances that have taken place in our …

The most commonly cited apomorphy of Archosauriformes is an opening in the snout known
as the antorbital cavity. Despite the ubiquity and prominence of the antorbital cavity, its …

Department of Biology, University of Maryland, College Park, MD; apopper@ umd. edu One
of the “problems” in working with aquatic animals is that they are not nearly as easy to …

Abstract and Summary I. 7 vocalizations emitted in the predator context are defined in terms
of their function. The physical and physiological constraints on the evolution of the physical …

The comparative hearing of birds and reptiles should always be considered together. It is
clear from the vertebrate fossil record that birds and reptiles split over 200 million years ago …

Sound spectrograms have been a traditional method for comparing animal vocalizations
and demonstrating their similarities or differences, but quantification of the comparative …

Active space, that distance from the source over which signal amplitude remains above the
detection threshold of potential receivers, was determined for Red-winged Blackbird …

Over 14 families of moths have ears that are adapted to detect the ultrasonic echolocation
calls of bats. On hearing a bat, these moths respond with an escape response that reduces …

The ability to locate the source of a sound too brief to be either scanned or tracked using
head or pinna movements is of obvious advantage to an animal. Since most brief sounds …