platypus mothers lay eggs and produce milk
The developmental pathways of the platypuses of Australia and New Guinea are a combination of reptilian, avian, and mammalian characteristics. Platypus mothers are physiologically specialized to produce both eggs and milk. They have a single urogenital opening for both reproductive and waste products. Photo via Adobe Stock Platypus Mothers Lay Eggs After a very short period of internal gestation, just 15-21 days, females lay leathery eggs, each containing a developing fetus. Platypus moms generally lay
explosive breeding frogs
Many frog species exhibit something called explosive breeding. This is essentially a short breeding season wherein there is intense male:male competition for mates. Photo by Maxime Gilbert on Unsplash Often, many males will attempt to court the same female. The females are only sexually “available” for a short window of time. Explosive breeding is a desperate time for males of many anuran (frog and toad) species. It may be their only chance to pass on
primate breastfeeding
Weaning is a difficult thing to study and to quantify. Because of the multitude of factors involved that a mother cannot control (resources, predation, environmental stochasticity, number of previous offspring, offspring size, and sex), the time to wean could easily be different for each one of her infants. In fact, the most important variables in the weaning process involve a multitude of individual characteristics about mom herself. Image by Rajesh Balouria from Pixabay Weaning is
Mating plugs are found in almost all groups of animals, from tiny nematodes to some of our closest primate relatives. Due to the often-contrasting needs of males versus females, the behavioural and physiological strategies with respect to mating plugs are as diverse as the organisms utilizing them. The use of these “chastity belts” in the animal kingdom is widespread and extremely common for a number of biologically relevant reasons. 1. She’s taken The most common

October 23, 2019

Sexual Cannibalism

Sexual cannibalism represents perhaps the most extreme form of conflict between the sexes. This kind of behaviour is observed in several species of praying mantids and spiders, and there is tremendous diversity in the extent to which it occurs. Up to 63% of the diet of female praying mantids is male praying mantids. Females have much to gain, and potentially much to lose, by being sexually cannibalistic. If she plays it right, a female can
As a wild sex expert, I know a lot about the ins and outs of mating in the animal kingdom, and let me tell you, it sure is tough to be a bedbug! Bedbug sex is traumatic. It is actually known as “traumatic insemination” because of how violent it is. Here are six things you may not have known about bedbug sex: Photo via Shutterstock 1. Male bedbugs have sword-like penises. Yep, they’re called parameres,
Traumatic mating has evolved repeatedly in several animal phyla. It is most common among arthropods – invertebrates with exoskeletons. Many kinds of behaviours fall into the general category of trauma, starting with those that involve non-genital structures that serve purposes other than those of direct sperm transfer. The technical term here, which provides a delightful description, is extra genital wounding structures. It aptly describes the fact that these appendages serve to secure sexual partnerships with