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The two are directly connected by blood vessels, an unusual organization of the circulatory system referred to as a portal system. The portal system allows for the direct and efficient transport of hormones from the hypothalamus to targets within the pituitary. circadian rhythms daily, 24-hour cycles of behavior in response to internal biological cues Other hormones are under cyclical control. Cycles can be short, lasting hours, or much longer, spanning several months. Melatonin is a hormone produced by the pineal gland whose level follows a daily cycle.

Research also revealed that the lions were expanding their range into new areas as competition for habitat increased. Since animals compete for food and space, some lions were being forced out of their ranges and ending up in residential or recreational areas where problems were more likely to occur. Wildlife officials recommended controversial safety precautions as well as habitat protection for the lions. California voters approved a mountain lion initiative in 1990 that prohibited the hunting of lions.

These swift and efficient predators found the smaller, forest-dwelling horses to be easy prey, resulting in the swift extinction of the horses. This kind of selection pressure favored the swifter and more wary equids of the open grasslands. So as one horse lineage died out, another evolved quickly. This pattern continued until the end of the Pleistocene epoch about 11,000 years ago. Only one species of horse, Equus equus, remains from this once diverse group of animals. natural selection process by which organisms best suited to their environment are most likely to survive and reproduce climate long-term weather patterns for a particular region habitat physical location where an organism lives in an ecosystem herbivores animals who eat plants only The Story of the Bones All information scientists know about ancient horses has been gathered from the fossil remains of their skeletons.

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