April 21, 2021

Horned lizard – Video Learning – WizScience.com



“Horned lizards” are a genus of lizards which are the type genus of the family Phrynosomatidae. The horned lizard is popularly called a “”horned toad””, “”horny toad”” or “”horned frog””, yet it is neither a toad nor a frog. The popular names come from the lizard’s rounded body and blunt snout, which make it resemble a toad or frog . The spines on its back and sides are made from modified scales, whereas the horns on the heads are true horns . Of 15 species of horned lizards in North America, eight are native to the United States. The largest-bodied and most widely distributed of the US species is the Texas horned lizard .

Horned lizards are morphologically similar to the Australian thorny devil , but are only distantly related. They also have other similarities, such as being sit-and-wait predators and preying upon ants, so the two groups are considered a great example of convergent evolution.

Horned lizards use a wide variety of means to avoid predation. Their coloration generally serves as camouflage. When threatened, their first defense is to remain still to avoid detection. If approached too closely, they generally run in short bursts and stop abruptly to confuse the predator’s visual acuity. If this fails, they puff up their bodies to cause them to appear more horned and larger, so that they are more difficult to swallow. At least eight species are also able to squirt an aimed stream of blood from the corners of the eyes for a distance of up to 5 ft. They do this by restricting the blood flow leaving the head, thereby increasing blood pressure and rupturing tiny vessels around the eyelids. This not only confuses predators, but also the blood tastes foul to canine and feline predators. It appears to have no effect against predatory birds. Only three closely related species are certainly known to be unable to squirt blood. To avoid being picked up by the head or neck, a horned lizard ducks or elevates its head and orients its cranial horns straight up, or back. If a predator tries to take it by the body, the lizard drives that side of its body down into the ground so the predator cannot easily get its lower jaw underneath.

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