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Some reptiles use incubation temperatures to determine sex. In some species, this follows the pattern that eggs in extremely high or low temperatures become female and eggs in medium temperatures become male. [14] Within the mechanism, two distinct patterns have been discovered and named Pattern I and Pattern II.
A female mallard duck incubates her eggs. Egg incubation is the process by which an egg, of oviparous (egg-laying) animals, develops an embryo within the egg, after the egg's formation and ovipositional release. Egg incubation is done under favorable environmental conditions, possibly by brooding and hatching the egg.
A female crested gecko only has to mate with a male once in order to lay 2 eggs every 4–6 weeks for a breeding cycle of upwards of 8–10 months. After a breeding cycle, females in the wild go through a "cooling" cycle, usually prompted by slight temperature and daylight changes over the winter season. [ 14 ]
Lesser rough-snouted giant gecko, Rhacodactylus trachycephalus; Willi's giant gecko, Rhacodactylus willihenkeli [2] A revision of the giant geckos of New Caldonia found weak support for inclusion of some taxa allied to this genus, and these have been assigned to new combinations: [3] Correlophus ciliatus, crested gecko; formerly R. ciliatus
The jugal bone is large and in contact with the gecko's infraorbital processes [3] while ornamentation upon the dorsal surface of the skull is present. [3] Eurydactylodes have 27 scleral ossicles present in one eyeball and nasal process which is wide, short and large. [ 3 ]
The white shell only forms when the egg has been fertilized and females will sometimes lay infertile, unshelled yellowish eggs known as "slugs". [130] The female lays one (occasionally two) eggs per time, [15] [48] [129] which typically is placed casually on the ground among leaf-litter, under debris, logs or rocks, or in a small hole.