Gambelia
wislizenii
(Longnose Leopard Lizard)
Key Characteristics |
Dark spots or blotches
on light ground color |
Granular scales |
Rounded tail |
General Description:
Longnose Leopard Lizards
have large muscular heads and bodies.
They have granular scales with a light cream or tan ground color dorsally, and
this is marked by a pattern of brown
or black spots. The dark spots
form two rows, which become more apparent on the long rounded tail.
The tail can be more than twice the lizard's body length (Nussbaum et al. 1983).
The coloration of Longnose Leopard Lizards can vary dramatically depending on
the time of day (or their temperature). When cool, they appear very dark,
and the dark spots are less prominent while light
transverse lines become much more apparent (Storm and Leonard 1995).
The ventral surface has a light coloration
of white or cream that contrasts with the dark lines on the throat. The
inside lining of the mouth and throat are black and when threatened, these lizards
will readily reveal this by gaping their mouth and attempting to bite.
Longnose Leopard Lizards, along with Mojave Black-collared Lizards, are the largest lizards found in Idaho, as well the entire Northwest. Female Longnose Leopard Lizards are larger than males, with snout vent lengths of around 116 mm (4.6 in.) and total lengths of 331 mm (13 in.), (Storm and Leonard 1995). Like Mojave Black-collared Lizards, Longnose Leopard Lizards utilize their size and agility to include smaller lizards and other vertebrates in their diet. However, they do not eat other lizards exclusively. Based on the stomach contents of 21 lizards from southeastern Oregon, orthopterans (crickets and grasshoppers) may make up nearly half of their diet (Nussbaum et al. 1983).
Determining the sex of individual Longnose Leopard Lizards during the breeding season is relatively easy, due to the vivid salmon to orange color present on the neck and body and tail of females. These lizards mate in the spring, laying 4 to 7 eggs in June, which hatch in August or September (Storm and Leonard 1995). The neonates resemble the adults except that the light colored transverse lines are much more visible and they may have a reddish-rust color between the lines (Storm and Leonard 1995).
Habitat:
Longnose Leopard
Lizards inhabit arid regions of the Northwest (Nussbaum et al. 1983).
The soil is generally sandy, but may be other types (e.g. gravel
or loess) as long as numerous rodent burrows are available (Behler and King
1979, Nussbaum et al. 1983). These lizards utilize burrows frequently
and if the soil is suitable, they are capable of digging their own burrows.
The surrounding vegetation
is usually sparse and consists of desert shrubs and patchy clumps of grass
(Storm and Leonard 1995). These lizards run after their prey (Stebbins
1985) and consequently thick vegetation is an impediment.
Idaho
Distribution:
In Idaho the Longnose Leopard Lizard can be found in suitable habitat across
much of southern portion of the state. From
Idaho and Oregon, south to southern Baja California and north-central Mexico.
Diet:
Eats insects, spiders, lizards, small
rodents, and some plant material.
Defense:
Ground-dwelling, but sometimes climbs
into bushes. Home range varies; Nevada study identified range as less than 2˝
ha, and population density as 5/ha. Hibernates/aestivates.
Uses burrows of pocket mice and kangaroo rats. Inactive in underground burrows
in cold weather. First active in early April in southeastern Arizona; in some
areas, active in summer months only. One of the few lizards with a voice.
Reproduction:
In Idaho, lays clutch of 3-4 eggs in
June or July. Eggs hatch in 5-7 wk; individuals become sexually mature in first
or second year. Idaho study found years with spring rains led to greater insect
prey availability and consequent higher rate of reproduction.
Conservation:
Status: |
Unprotected nongame species |
Global Rank: |
|
State Rank: |
S5 |
Important State References:
Parker, W.S. and E.R. Pianka.
1976. Ecological observations on the leopard lizard (Crotaphytus wislizeni)
in different parts of its range. Herpetologica 32:95-114.