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Male giraffes assess female fertility by tasting the female's urine to detect oestrus, in a multi-step process known as the flehmen response. [90] [98] Once an oestrous female is detected, the male will attempt to court her.
In okapi, the male's ossicones are smaller in proportion to the head, and taper towards their tips, forming a sharper point than the comparatively blunt giraffe ossicone. Whereas female giraffes have reduced ossicones, female okapi lack ossicones entirely. The morphology of ossicones in the extinct relatives of giraffes and okapi varies widely.
The okapi's neck is long compared to most ruminants, but not nearly so long as the giraffe's. Male giraffes are the tallest of all mammals: their horns reach 5.5 m (18 ft) above the ground and their shoulder 3.3 m (11 ft), whereas the okapi has a shoulder height of 1.7 m (5 ft 7 in). [9]
A Penn State researcher has been trying to get to the bottom of the age-old question of why giraffes have long necks. Focus on research: Female giraffes drove the evolution of long necks, new ...
The Seneca Park Zoo’s other female Masai giraffe, Iggy, is also pregnant and within in her delivery window. Giraffe gestation periods range from 13 to 15 months making it difficult to predict a ...
Phenotypic differences between sexes are evident even in cultured cells from tissues. [129] For example, female muscle-derived stem cells have a better muscle regeneration efficiency than male ones. [130] There are reports of several metabolic differences between male and female cells [131] and they also respond to stress differently. [132]
Nyasi was born Aug. 9 and is the first giraffe born at the zoo in 12 years. The name Nyasi was chosen by a thin margin after nearly 4,000 votes were cast, Shepherd said.
Whereas the reticulated giraffe has very clearly defined dark patches with bright-whitish channels between them, Rothschild's giraffe more closely resembles the Masai giraffe. However, when compared to the Masai giraffe, the Rothschild's ecotype is paler, the orange-brown patches are less jagged and sharp in shape, and the connective channel is ...