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Ovarian progestins in Masai giraffe (Giraffa camelopardalis)

Gonadal progestins from fetal, juvenile, pregnant and non-pregnant Masai giraffe (Giraffa camelopardalis) were extracted, purified by TLC and measured by GLC or by competitive protein-binding assay. Progesterone was found in fetal ovaries and in a fibrotic CL from a nearterm fetus as well as in CL from juvenile animals. In pregnant animals, luteal progesterone probably increased with the duration of gestation. The values of 20β-hydroxyprogesterone were higher in juvenile giraffes than in the fetus or during early pregnancy. No 20β-hydroxyprogesterone

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Giraffa Camelopardalis

An overview on Giraffa camelopardalis including information on diagnosis/general characteristics, distribution, fossil record, form, function, ontogeny and reproduction, ecology, behavior, and genetics.

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Tactile encounters in a herd of captive giraffe

The behavior of the members of the herd of 18 giraffes at Taronga Zoo in Sydney, Australia, was studied for 5 months. The individuals were tolerant of each other, seldom fighting, not even over a receptive female. Sexually active males were the most active in initiating encounters. Calves showed little interest in the adult members of the herd. The 24-year-old male Ml, formerly the dominant male, seldom interacted with the other animals. Nosing and licking were the most common types

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Flehmen

Introduction Flehmen is a behavioral pattern that has been observed in almost all species of ungulates and in some felids. An individual flehmens when it detects an interesting smell — urine, faeces, a female’s vulva or even a chemical substance such as ether or valerian (Schneider, 1930). McHugh (1958) for example reports that wild female bison, Bison bison, have flehmened while nosing a rotten skeleton, human urine, a newborn calf and the torn scrotum of a bull. Usually flehmen occurs

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"Necking" behaviour in the giraffe

Previous references to “necking” behaviour, and the main features of the study area are briefly outlined. “Necking” behaviour in giraffe takes place only in all male herds. When the animals are in a head to head posture the intensity is either high or low, but when animals take up a head to tail posture the actions are always of high intensity and appear to have greater sexual significance. The significance of “necking” is discussed, and it is suggested that these

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The giraffe of Nairobi National Park: Home range, sex ratio, the herd and food

The giraffe of Nairobi National Park, Kenya have been studied for one year. Each animal seen has been photographed from the left side and the pattern on the neck used to recognize each individual. While the pattern may become darker with age, it does not significantly change in detail even over many years. At present 65 adult male, 72 adult female and 30 immature giraffe can be recognized. Movements of individuals are described as well as associations with other individuals.

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The sex ratio of the giraffe

61.5 per cent of the 117 young giraffes born in captivity were males. A similar preponderance of males has been observed among adult giraffes in Transvaal and in Amboseli National Reserve, but not in Nairobi National Park where 60.7 per cent of the adults were females. The possible causes of such abnormal sex ratios are discussed. (Article is in French)

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Ecological separation of the large mammal species in the Tarangire Game Reserve, Tanganyika

The ecological separation of 14 common ungulate species living in close contact with each other in a Tanganyika game reserve is shown to be achieved by six different factors: 1. the occupation of different vegetation types and broad habitats; 2. the selection of different types of food; 3. the occupation of different areas at the same season; 4. the occupation of the same area at different seasons; 5. the use of different feeding levels in the vegetation; 6. the occupation

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