Avian Ultraviolet Vision And Frequency-Dependent Seed Preferences

It is well established that ultraviolet sensitivity plays an important role in the visually guided behaviour of birds. From a foraging perspective, evidence now exists that ultraviolet wavelengths are used by birds when foraging for insects, berries, seeds and mammals. Here, we present the results of two laboratory experiments that test the effect of removing […]

Ultraviolet Reflection of Berries Attracts Foraging Birds. A Laboratory Study with Redwings (Turdus iliacus) and Bilberries (Vaccinium myrtillus)

Unlike humans, birds perceive ultraviolet (UV) light (320 to 400 nm), a waveband which is known to play a role in avian mate choice. However, less attention has been paid to the role of UV light in avian foraging. Some blue, violet and black berries reflect UV light. The colour of berries might be an […]

Effects of food density on the behavior and distribution of nonbreeding American flamingosin Yucatan, Mexico

We sampled potential food items of American Flamingos (Phoenicopterus ruber ruber) in the Celestún Estuary, Yucatán, Mexico, from October 1992 to January 1993, to explore the influence of food density and distribution on flamingo behavior in relation to the ideal free distribution model. Food items were found in the substrate and vegetation and were dominated […]

Sexual segregation by Masai giraffes at two spatial scales

In this paper alternative explanations for observed patterns of sexual segregation by giraffes are examined at two spatial scales: within-habitats and within-landscape. Habitats are defined as recognizable plant associations and the landscape as the collection of all available habitat types. The study was conducted in Mikumi National Park, Tanzania. At the within-landscape level, all sex […]

The neurobiology of positive emotions

Compared to the study of negative emotions such as fear, the neurobiology of positive emotional processes and the associated positive affect (PA) states has only recently received scientific attention. Biological theories conceptualize PA as being related to (i) signals indicating that bodies are returning to equilibrium among those studying homeostasis, (ii) utility estimation among those […]

Studying the behaviour and sensory ecology of marine mammals using acoustic recording tags: a review

Many marine animals use sound passively or actively for communication, foraging, predator avoidance, navigation, and to sense their environment. The advent of acoustic recording tags has allowed biologists to get the on-animal perspective of the sonic environment and, in combination with movement sensors, to relate sounds to the activities of the tagged animal. These powerful […]

The Behavioral Ecology of Intermittent Locomotion

Most physiological and ecological approaches to animal locomotion are based on steady state assumptions, yet movements of many animals are interspersed with pauses lasting from milliseconds to minutes. Thus, pauses, along with changes in the duration and speed of moves, form part of a dynamic system of intermittent locomotion by which animals adjust their locomotor […]

Pup development and maternal behavior in captive Key Largo woodrats (Neotoma floridana smalli)

This study describes the first systematic observations of maternal behavior and pup development of captive Key Largo woodrats (Neotoma floridana smalli) during the first 30 days of life. Data were collected on six litters of pups born to four dams between December 2006 and July 2007. Gestations for the six litters averaged 38 days and […]

Effect of feeding boxes on the behavior of stereotyping amur tigers (Panthera tigris altaica) in the Zurich Zoo, Zurich, Switzerland

Abstract 10.1002/zoo.10061.abs The stereotyped pacing shown by the two Amur tigers in the Zurich Zoo was hypothesized as being caused by permanently frustrated appetitive foraging behavior. Several electrically controlled feeding boxes were installed and access to each box was possible only twice a day for 15 min at semi-random times. The boxes had to be […]

Maracas for Macaca? Evaluation of three potential enrichment objects in two species of zoo-housed macaques

Abstract 10.1002/1098-2361(2000)19:33.3.CO;2-N One group each of Barbary macaques and stump-tailed macaques, both zoo-housed, received hard replica fruits in three experimental conditions: as empty (“unresponsive”) objects, as maracas that rattled when manipulated (“simple responsive”), and as objects from which food items could be extracted (“foraging devices”). Both groups manipulated the replica fruits most when they functioned […]