Hippo sex

Equal opportunity between the sexes, at least in a matter of numbers, exists for the embryos of many species. But some animals seem to exert some level of control in determining the sex of offspring, whether it be male or female, to shift the sex balance of populations in certain circumstances. While most previous studies focused on how females can shift the offspring sex balance, the researchers chose to focus on the male, and report their results in Nature Communications. The researchers employed fluorescence in situ hybridization, a method that coloured the sperms of each hippo with either X- or Y- chromosome specific dyes.
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Animals are kinkier than you

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Pablo Escobar’s Hippos Keep Having Sex and No One Is Sure How to Stop Them

When the male cabbage butterfly those white things buzzing around your picnic all summer sees a female he likes the look of he will mate with her — providing she is willing — by depositing a package of sperm and proteins. However in order to get a diverse range of offspring the female has developed and organ which can eat stuff from her vagina tract. MORE: Erections, sweat and fear: Here are some of the weird and horrible things spider bites can do to you. Two animals that certainly can are male dogs and cats, because both actually have bones in their penis, which on rare occasions can be fractured. MORE: Quiz: which animals harbour the darkest sexual secrets? In fact females pandas only come into heat once a year for a period that can be as short as 24 hours. Think you get tired after a spirited session in the sack?
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Hippo sperm discriminates against the male sex

When drug kingpin Pablo Escobar was killed by the Colombian National Police in , he left a vast and bloody legacy in his wake. Escobar's captive hippos were never meant for the rivers and estuaries of northern Colombia, yet since his death they've behaved as wild animals are wont to: by vigorously breeding and multiplying, slowly establishing themselves as the largest invasive species in the world. Today, it appears their troublesome reign is nowhere near ending because no one really knows how to stop them.
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