horned lizard

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Related to horned lizards: Phrynosoma

horned lizard

or

horned toad,

broad, flat-bodied lizards of the genus Phrynosoma, found in arid regions from extreme SW Canada to Guatemala. There are several species in the United States W of the Mississippi. The body is 3 to 5 in. (7.6 to 12.7 cm) long; it has a short, thin tail, a short neck, and short legs. There are spines on the head, sides, and back. Horned lizards are protectively colored, usually in dull grays and browns. They feed on insects, especially ants, and are often found buried in the sand, with only their heads exposed. In some species the female lays eggs; in others the eggs are incubated internally and the young are born alive. When alarmed, members of some species eject a thin stream of blood from the nictitating membrane of the eye for a distance of several feet. Horned lizards are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Reptilia, order Squamata, family Iguanidae.
References in periodicals archive ?
The population of flat-tailed horned lizards in the Coachella Valley experienced a 4-year decline, yet was able to recover.
Hatchlings began hibernation [greater than or equal to]6 weeks later than adult Texas horned lizards.
2002), there are concerns that hibernating reptiles in southern Texas, such as the Texas horned lizard (Phrynosoma cornutum), might suffer direct mortality from management activities, including prescribed fire (Fair and Henke, 1997).
The detoxification of ant (Pogonomyrmex) venom by a blood factor in horned lizards (Phrynosoma).
Texas horned lizards (a diet and habitat specialist; Donaldson et al.
DISCUSSION--In our study, diagnostic traits were used to explore morphological variation in nine populations of horned lizards (P.
2002: Lemm, 2006; McGurty, 1980) that increasing human populations and consequent habitat destruction may have caused a rapid decline in the populations of horned lizards in San Diego, Orange, Riverside, Los Angeles, and San Bernardino Counties.
When pet owners tire of the horned lizards as hard to raise as African violets, they find their way into her reptile house.
Physiological (rapid) change of color in horned lizards (Phrynosoma) of arid habits.
For example, male deep-sea anglerfish attach themselves to their mates, parasite-style, for life, and horned lizards squirt blood from their eyes to ward off attackers.
The cool, quiet air of a spring morning gives way to the wakening of jackrabbits, quail, ground squirrels, and horned lizards as the sun quickly warms the Coolgardie Mesa in the western Mojave Desert of California.
Outside, in a wire cage, his two Texas horned lizards were standing in an unusual way.