Search results
Results from the WOW.Com Content Network
List of animals displaying homosexual behaviour; r/K selection theory; House mouse § Social behavior includes polygamy; Sexual behavior of dogs; Sexual behavior of horses; Non-reproductive sexual behavior in animals; Sequential hermaphroditism – Sex change as part of the normal life cycle of a species
Polycyclic animals reproduce intermittently throughout their lives. Semelparous organisms reproduce only once in their lifetime, [27] such as annual plants (including all grain crops), and certain species of salmon, spider, bamboo and century plant. [28] Often, they die shortly after reproduction. This is often associated with r-strategists.
Insect species make up more than two-thirds of all extant animal species. Most insect species reproduce sexually, though some species are facultatively parthenogenetic. Many insect species have sexual dimorphism, while in others the sexes look nearly identical. Typically they have two sexes with males producing spermatozoa and females ova.
Animal reproductive system (7 C, 46 P) Asexual reproduction in animals (1 C, 10 P) B. Bird breeding (3 C, 26 P) ... Pages in category "Reproduction in animals"
The mammalian male reproductive system contains two main divisions, the penis and the testicles, the latter of which are where sperm are produced and usually held in a scrotum. [5] In humans, both of these organs are outside the abdominal cavity , but they can be primarily housed within the abdomen in other animals.
The biologist Thierry Lodé proposed (2001, 2012) five modes of reproduction based on the relationship between the zygote (fertilised egg) and the parents: [1] [2]. Ovuliparity: fertilisation is external, the oocytes being released into the environment and fertilised outside the body by the male. [1]
A sexual system is a distribution of male and female functions across organisms in a species. [1] [2] The terms reproductive system and mating system have also been used as synonyms. [3] Sexual systems play a key role in genetic variation and reproductive success, and may also have led to the origin or extinction of certain species. [4]
Nesting behavior is an instinct in animals during reproduction where they prepare a place with optimal conditions to nurture their offspring. [1] The nesting place provides protection against predators and competitors that mean to exploit or kill offspring. [ 2 ]