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Female crickets can potentially gain both direct and indirect benefits from mating multiple times with different males. Most studies have only examined the effects of small numbers of matings, although female crickets are capable of mating many times. The goal of this paper is to examine the direct and indirect benefits of mating large numbers of times for female reproductive success. In a previous experiment, female Gryllus vocalis were found to gain diminishing direct benefits from mating large numbers of times.

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Although small, earthworms provide big benefits to soil by aerating it as they burrow and enriching it as they eat and excrete organic material. One myth of earthworm reproduction is that if you cut them in half, the two halves will regenerate into two new worms. Although worms can regenerate small portions of their bodies, they do not reproduce this way. From hermaphrodites to mucous cocoons, earthworm reproductive habits are more fascinating than the myths. Earthworms are members of the annelid phylum. The word "annelid" means "small rings"; if you look closely at an earthworm, you'll see that the body appears to be surrounded by small rings. These rings are segments that keep the worm flexible and mobile.
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The Introduction Article is just the first of 11 articles in each species account that provide life history information for the species. The remaining articles provide detailed information regarding distribution, migration, habitat, diet, sounds, behavior, breeding, current population status and conservation. Written and continually updated by acknowledged experts on each species, Birds of North America accounts include a comprehensive bibliography of published research on the species. Chin, throat, and sides of neck chestnut, the center and base of throat metallic greenish or bluish black.
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I f you've been around free-ranging chickens or turkeys, you may have seen some bird sex first-hand, and you know that in these species the males have sexual organs. This isn't typical among birds, however. Most birds completely lack external sexual organs -- including the males.
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