Body temperature and thermoregulation of Komodo dragons in the field

Komodo dragons from hatchlings (≈0.1 kg) to adults (≤80 kg) express the full magnitude of varanid species size distributions. We found that all size groups of dragons regulated a similar preferred body temperature by exploiting a heterogeneous thermal environment within savanna, forest and mangrove habitats. All dragons studied, regardless of size, were able to regulate […]

Lizards and landscapes: integrating field surveys and interviews to assess the impact of human disturbance on lizard assemblages and selected reptiles in a savanna in South Africa

Habitat degradation through over-grazing and wood collection is especially prevalent in developing countries such as South Africa. As human populations expand and the demand for land increases, the traditional idiom of setting aside protected areas for conservation is insufficient and assessment and protection of diversity outside these areas is needed. We assessed the impact of […]

Habitat Suitability for Reptiles in the Goravan Sands Sanctuary, Armenia

The Goravan Sands Sanctuary is an important Armenian wildlife conservation area. The objectives of my study were to assess habitat suitability for reptiles within the sanctuary by comparing species richness, total abundance and species diversity across 35 random quadrats. I present the mean abundance of 5 reptiles: Phrynocephalus persicus, Eremais pleskei, Eremias strauchi, Lacerta strigata […]

Behavioral, neurophysiological and evolutionary perspectives on unihemispheric sleep

Several animals mitigate the fundamental conflict between sleep and wakefulness by engaging in unihemispheric sleep, a unique state during which one cerebral hemisphere sleeps while the other remains awake. Among mammals, unihemispheric sleep is restricted to aquatic species (Cetaceans, eared seals and manatees). In contrast to mammals, unihemispheric sleep is widespread in birds, and may […]

Experimental evaluation of environmental enrichment of sea turtles

Abstract 10.1002/zoo.20145.abs Although behavioral studies have been conducted at zoos and aquaria for years, documentation concerning the effectiveness of environmental enrichment has dealt primarily with terrestrial animals and marine mammals. Few enrichment studies have been conducted on reptiles. For this study, behavioral observations were made on four captive sea turtles (three loggerhead, Caretta caretta, and […]

Semen collection and evaluation in free-ranging Brazilian rattlesnakes (Crotalus durissus terrificus)

Abstract 10.1002/zoo.20126.abs Two hundred-ninety species of reptiles are estimated to need urgent action for conservation, with at least 113 threatened species worldwide. The International Union for Conservation of Nature and Natural Resources (IUCN) Red List of Threatened Species includes 80 species of snakes, with six native Brazilian species, a number likely to be an underestimation. […]

Preliminary observations on the relationship of calcium ingestion to vitamin D status in the green iguana (Iguana iguana)

Abstract 10.1002/(SICI)1098-2361(1997)16:33.3.CO;2-0 We hypothesized the vitamin D-deficient green iguanas with depleted calcium stores would seek to augment calcium intake by self-selection of a high calcium source. Eight green iguanas were offered free-choice ground oystershell in addition to their regular diet. Of these, two had not been exposed to ultraviolet (UV-B) radiation for > 5 years […]

Metabolic scaling of antibiotics in reptiles: Basis and limitations

Abstract 10.1002/(SICI)1098-2361(1996)15:33.3.CO;2-P The allometric equation y = a · xb has been used to scale many morphological and physiological attributes relative to body mass. For instance, in eutherian mammals, the equation Pmet = 70Mb0.75 has been used to describe the relationship between metabolic rate (Pmet) and body mass (Mb). Similar equations have been derived for […]

Dominance hierarchies in male lizards: Implications for zoo management programs

Abstract 10.1002/zoo.1430130510.abs Depending on spatial requirements and the distribution of key resources in the environment, social behavior among lizards varies from defense of exclusive territories to the establishment of dominance hierarchies. In captivity or under conditions where dispersal is not possible, dominance hierarchies often emerge in species that are otherwise territorial. This review explores some […]

Visual discrimination and reversal learning in rough-necked monitor lizards (Varanus rudicollis)

Reptile learning has been studied with a variety of methods and has included numerous species. However, research on learning in lizards has generally focused on spatial memory and has been studied in only a few species. This study explored visual discrimination in two rough-necked monitors (Varanus rudicollis). Subjects were trained to discriminate between black and […]