The origin of lactation as a water source for parchment-shelled eggs.

On the Origin of Species by Means of Natural Selection

1953 • 5,543 citations

Biology of Amphibians

1986 • 3,886 citations

Water Relations of Plants and Soils

1995 • 1,604 citations

Reproductive Physiology of Marsupials

1987 • 733 citations

Biochemistry of the Avian Embryo

1967 • 518 citations

The earliest known eutherian mammal

2002 • 453 citations

Mammal-Like Reptiles and the Origin of Mammals.

1982 • 443 citations

The orders of mammals

2011 • 382 citations

Review of the Pelycosauria

1980 • 364 citations

Water in the Avian Egg Overall Budget of Incubation

1980 • 326 citations

The physiological ecology of reptilian eggs and embryos.

1988 • 320 citations

Physiological effects of incubation temperature on embryonic development in reptiles and birds

1991 • 297 citations

The Evolution of Endothermy in Mammals and Birds: From Physiology to Fossils

1995 • 259 citations

Dinosaur Eggs and Babies

1994 • 223 citations

The mammary gland and its origin during synapsid evolution.

2002 • 223 citations

On the Composition of Bird Eggs

1987 • 182 citations

The evolution of nasal turbinates and mammalian endothermy

1992 • 163 citations

Physiological and ecological importance of water to embryos of oviparous reptiles

1991 • 148 citations

Vertebrate Burrow Complexes from the Early Triassic Cynognathus Zone (Driekoppen Formation, Beaufort Group) of the Karoo Basin, South Africa

2001 • 144 citations

TURBINATES IN THERAPSIDS: EVIDENCE FOR LATE PERMIAN ORIGINS OF MAMMALIAN ENDOTHERMY

1994 • 141 citations

Evolution of placentation among squamate reptiles: recent research and future directions

2000 • 139 citations

Epipubic bones in eutherian mammals from the Late Cretaceous of Mongolia

1997 • 127 citations

MORPHOLOGY AND EVOLUTION OF THE EGG OF OVIPAROUS AMNIOTES

1997 • 121 citations

Ontogeny of Amniote Fetal Membranes and Their Application to Phylogeny

1977 • 120 citations

Mass extinction of peat-forming plants and the effect on fluvial styles across the Permian–Triassic boundary, northern Bowen Basin, Australia

2002 • 117 citations

Water Relations of Chelonian Eggs and Embryos: Is Wetter Better?

1999 • 115 citations

Placentation in the garter snake, Thamnophis sirtalis

1970 • 112 citations

Evolution of hindlimb posture in nonmammalian therapsids: biomechanical tests of paleontological hypotheses

2001 • 109 citations

Water Balance of Terrestrial Anuran (Eleutherodactylus Coqui) Eggs: Importance of Parental Care

1984 • 96 citations

Yolk sac placentation in reptiles: Structural innovation in a fundamental vertebrate fetal nutritional system

1993 • 92 citations

Shivering Thermogenesis in a Brooding Diamond Python, Python spilotes spilotes

1984 • 83 citations

Physical factors affecting the water exchange of buried reptile eggs

1991 • 82 citations

The origins of lactation and the evolution of milk: a review with new hypotheses

1989 • 78 citations

Physical characteristics of reptilian eggs and a comparison with avian eggs

1991 • 77 citations

Growth patterns deduced from the bone histology of the cynodontsDiademodonandCynognathus

2001 • 72 citations

Maternal-fetal transfer of3H-labelled leucine in the viviparous lizardNiveoscincus metallicus (scincidae: Lygosominae)

1997 • 66 citations

EVOLUTION OF THE AMNIOTE EGG

1997 • 61 citations

The mammary gland of the echidna, Tachyglossus aculeatus' with observations on the incubation of the egg and on the newly‐hatched young

1969 • 60 citations

Influence of the evolution of viviparity on eggshell morphology in the lizardLerista bougainvillii

1996 • 56 citations

Caloric Content of Lizard and Snake (Reptilia) Eggs and Bodies and the Conversion of Weight to Caloric Data

1978 • 56 citations

Dicynodont (Therapsida) bone histology: phylogenetic and physiological implications

1993 • 54 citations

Gas exchange across reptilian eggshells

1991 • 51 citations

New therapsid specimens and the origin of the secondary hard and soft palate of mammals

2009 • 50 citations

Further Observations on Thermoregulation in the Brooding Female Python molurus bivittatus (Serpentes: Boidae)

1978 • 49 citations

Water economy and solute regulation of reptilian and avian embryos

1991 • 48 citations

Interrelations Among Water and Energy Relations of Reptilian Eggs, Embryos, and Hatchlings

1985 • 47 citations

Utilisation of lipids, protein, ions and energy during embryonic development of Australian oviparous skinks in the genus Lampropholis

2001 • 46 citations

A molecular model for the evolution of endothermy in the theropod-bird lineage

2001 • 45 citations

Avian Reproduction over an Altitudinal Gradient. II. Physical Characteristics and Water Loss of Eggs

1983 • 43 citations

Origin of the Amniote Egg

1957 • 43 citations

Influence of diminished respiratory surface area on survival of sea turtle embryos

2001 • 41 citations

Tolerance of Variation in Eggshell Conductance, Water Loss, and Water Content by Red-Winged Blackbird Embryos

1986 • 41 citations

Thermoregulation in a Brooding Female Python molurus bivittatus (Serpentes: Boidae)

1976 • 38 citations

Monotreme development with particular reference to the extraembryonic membranes

1993 • 37 citations

Egg-shape in birds

1991 • 36 citations

Energy and Water Vapor Exchange by Parchment-Shelled Reptile Eggs

1985 • 36 citations

Incubation Water Loss in King Penguin Egg. I. Change in Egg and Brood Pouch Parameters

1989 • 35 citations

The avian eggshell as a mediating barrier: respiratory gas fluxes and pressures during development

1991 • 34 citations

The Origin and Evolution of Mammary Glands

1969 • 32 citations

The Development of the Monotremata.—Part VI. The Later Stages of Cleavage and the Formation of the Primary Germ‐layers.

1947 • 32 citations

Aspects of Calcium Regulation in Embryonic Lepidosaurians and Chelonians and a Review of Calcium Regulation in Embryonic Archosaurians

1996 • 30 citations

Water Exchange in Reptilian Eggs

1987 • 30 citations

Incubation time in reptilian eggs

1996 • 27 citations

The mammary apparatus of the mammalia : in the light of ontogenesis and phylogenesis

1920 • 25 citations

Water Relations of Desert Iguana (Dipsosaurus dorsalis) Eggs

1981 • 22 citations

Adaptation of the Pigeon Egg to Incubation in Dry Hot Environments

1988 • 21 citations

Factors Modifying Rate of Water Loss from Birds' Eggs during Incubation

1990 • 21 citations

Influence of incubation water content on oxygen uptake in embryos of the Burmese python (Python molurus bioittatus)

1984 • 19 citations

Shell Conductance, Daily Water Loss, and Water Content of Puna Teal Eggs

1989 • 19 citations

The Water Balance of Bird Eggs Incubated in Water

1984 • 19 citations

An analysis of epipubic bone function in mammals using scaling theory

1989 • 18 citations

A Role for Aggregation Pheromones in the Evolution of Mammallike Reptile Lactation

1983 • 17 citations

A Comparison of Avian and Reptilian Chorioallantoic Vascular Density

1993 • 14 citations

Oxygen Consumption, Air-Cell Gas Tensions, and Incubation Parameters of Mute Swan Eggs

1991 • 12 citations

Incubation Water Loss in King Penguin Egg. II. Does the Brood Patch Interfere with Eggshell Conductance?

1989 • 11 citations

Gas transfer by the neonate in the pouch of the tammar wallaby, Macropus eugenii

1984 • 10 citations

Not every “egg” is an egg

1986 • 7 citations

Whey proteins in early and late milks of monotremes (Monotremata: Tachyglossidae, Ornithorhynchidae) and of the tammar wallaby (Macropus eugenii, Marsupialia: Macrropodidae).

1992 • 6 citations

Endocytosis in the embryonic chick chorionic epithelium.

1987 • 5 citations