Change in forearm curvature throughout the summer in female big brown bats

Article Abstract:

Sampled female Eptesicus fuscus had their extended left wing measured along critical bone segments. Radius curvature decreases gradually throughout pregnancy and lactation followed by increasing curvature during post-lactation until summer-roost abandonment in female Eptesicus fuscus. Male bats have continuous bone accretion throughout the summer season. The observed decrease in radius curvature improves lift and control, and thereby increase foraging efficiency during times of big energy demands.

Bones, Growth, Bats, Bats (Animals), Animal flight, Bone development

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Size of testes and scent glands in capybaras, Hydrochaeris hydrochaeris (rodentia: caviomorpha)

Article Abstract:

A random sample of slaughtered adult male capybaras (Hydrochaeris hydrochaeris) was studied. A significant correlation, independent of body mass, exists between testes mass and morrillo (snout scent gland) volume. Morrillo volume and testes mass both correlated significantly with age class. Morrillo volume is found to dictate the social rank of a male. Older males tend to have greater scent gland activity and reproductive success, and are therefore more likely to be dominant.

Testis, Scent glands

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Systematics of Aconaemys (Rodentia, Octodontidae)

Article Abstract:

Cranial morphometrics, qualitative character variation and karyotypes were used to reassess the systematics of three initial species of the genus Aconaemys. Each species has distinct karyotypes. Contrasting patterns of cranial and mandibular morphology fortify the karyotypic evidence that there are three distinct species, A. fuscus, A. sagei and A. porteri. The genus Aconaemys is native to the coniferous forests of Chile and Argentina.

Analysis, Identification and classification, Rodents, Chromosomes, Zoology, Animal taxonomy

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