Skip navigation! Story from Sex. Bonus: Many of the stories on these websites were written by women, for women.
Pair collaborative behavior may play an important role in avian reproduction. However, evidence for this mainly comes from certain ecological groups e. We studied the coordination of parents in foraging and its effect on food provisioning rate and chick growth in a small seabird, the Dovekie Little auk, Alle alle.
Analyzed the data: SJ AV. Such differences in growth parameters can cause the sexes to be impacted by environmental variability in different ways, and understanding these differences allows a better understanding of patterns in productivity between individuals and populations. We measured mass and length of flipper, bill, tibiotarsus, and foot at 5-day intervals for 45 male and 40 female individually-marked chicks.
A recent study of the skulls of human ancestors and modern humans finds that women, and thereby, evolution, selected for males with relatively short upper faces. The region between the brow and the upper-lip is scrunched proportionately to the overall size of their heads. In a past study, researchers found a similar facial pattern in chimpanzees, with males having relatively shorter and broader faces compared with females, controlling for body size.
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Please refresh the page and retry. A same-sex penguin couple has been entrusted with an adopted newborn chick at a London aquarium. In a first for the venue, the pair was blessed with a newborn after patiently incubating the egg.