Mammals of the San Gabriel Mountains of California Part 12

Family FELIDAE

=Lynx rufus californicus= Mearns

Wildcat

Wildcats range over the whole of the San Gabriel Range, with the possible exception of the tops of the highest peaks such as Mt. San Antonio and Mt. Baden Powell. Sign of these animals has been observed, or specimens have been taken, from the coastal sage belt up to about 8500 feet in the yellow pine forests on Blue Ridge. The subspecies _baileyi_ occurs on the desert slope of the range.

Wildcats are most common in the chaparral belt where they forage widely from the ridges down into the canyons. Judging from trapping records bobcats are not so common here as the gray fox.

Bobcats occur in the sage belt, where they are most common in the broken country around washes and in brushy areas. Although bobcats and coyotes occupy the same general areas here, the habitat preferences of these animals seem to be different, with coyotes occupying the more open country. An indication of the hunting habits of bobcats is furnished by the occurrence of ma.s.ses of p.r.i.c.kly-pear thorns beneath the skin of the legs, particularly the forelegs, of three specimens trapped in the sage belt. These thorns probably were acquired while the bobcats foraged for woodrats or cottontails in the patches of p.r.i.c.kly-pear, which are locally abundant in the sage belt.

On March 12, 1951, a small subadult female bobcat, trapped at 4000 feet in San Antonio Canyon, was found dead in the trap and had numerous deep cuts around its head and shoulders, and severe bruises on the right shoulder. The s.p.a.cing of the cuts, and the tracks around the set, indicated that while held in the trap this animal had fought with a second bobcat that had inflicted the fatal wounds. It seems unlikely that the fight was caused by a male attempting to copulate with the female held in the trap, for the female was found to be carrying an embryo.

In Live Oak Canyon, in December, 1950, tracks and bits of fur indicated that a bobcat had killed and eaten a gray squirrel. Remains of cottontails were found in the stomachs of two bobcats. All six bobcats from the Pacific slope had nematode worms in the pyloric end of the stomach.

Two females obtained on March 12 and 19, 1951, each had one embryo approximately one inch long (rump to crown).

The following list gives the weight of each of the specimens from the Pacific slope of the San Gabriels.

_Specimens examined._--Total, 8, distributed as follows: Los Angeles County: San Antonio Canyon, 4000 ft., 1; San Antonio Canyon, 3200 ft., 1; 4 mi. N Claremont, 1900 ft., 2; Thompson Canyon, 1800 ft., 1; 3 mi. NE Claremont, 1700 ft., 2; Little Dalton Canyon, 1500 ft., 1 (PC).

TABLE 12.--WEIGHTS OF LYNX RUFUS CALIFORNICUS FROM THE SAN GABRIEL MOUNTAINS.

===================================================================== s.e.x and age | locality | date | weight -------------+----------------------------+----------------+--------- [Female] ad. |3 mi. NE Claremont, 1700 ft.|January 20, 1951|18.8 lbs.

-------------+----------------------------+----------------+--------- [Female] sad.|4 mi. N Claremont, 1900 ft. |March 9, 1951 |12.5 "

-------------+----------------------------+----------------+--------- [Male] ad. |Thompson Canyon, 1800 ft. |January 15, 1948|13.2 "

-------------+----------------------------+----------------+--------- [Male] sad. |4 mi. N Claremont, 1900 ft. |January 26, 1951|11.3 "

-------------+----------------------------+----------------+--------- [Male] ad. |3 mi. NE Claremont, 1700 ft.|January 27, 1951|13.8 "

-------------+----------------------------+----------------+--------- [Male] sad. |San Antonio Canyon, 4000 ft.|March 12, 1951 | 7.9 "

-------------+----------------------------+----------------+--------- [Male] sad. |San Antonio Canyon, 3200 ft.|March 17, 1951 |11.2 "

=Lynx rufus baileyi= Merriam

Wildcat

This subspecies is widely distributed on the desert slope of the range, and was recorded down to the lower edge of the juniper belt. Tracks were observed on many occasions in yellow pine forest, but wildcats seemed to be commonest in the brushy parts of the pinyon-juniper a.s.sociation. Two were trapped in small draws lined with pinyons and scrub oak, and two at the base of rocky pinyon-covered slopes. Only occasionally were tracks noted in the lower part of the juniper belt. Bobcats are most numerous where woodrats also reach peak abundance, suggesting that woodrats are a major food.

The four specimens from the desert slope, although exhibiting a wide range of variation, are all representatives of the desert race _baileyi_. A yearling male from near the head of Grandview Canyon, at 5200 feet elevation, has the profuse black spotting of the subspecies _californicus_, but the general pallor dorsally is characteristic of the desert subspecies. An adult female, from 4700 feet elevation in Graham Canyon, shows the double mid-dorsal black line and the distinct black markings around the face characteristic of _californicus_, but is otherwise pale with reduced black patterns on the backs of the ears. The other two specimens, an adult male and a yearling female, are typical examples of _baileyi_, pale, and with reduced black markings. None of the specimens of bobcats from the coastal slope of the mountains showed characters approaching those of _baileyi_. It seems, therefore, that these two subspecies intergrade on the interior slope of the range.

A yearling male weighed 12 pounds, and a yearling female weighed 10.5 pounds. An old male weighed 19.6 pounds, and an adult female weighed 15.1 pounds.

Remains of deer were in two of the bobcat stomachs, and one of these stomachs also contained jack rabbit remains. Approximately a dozen nematodes (stomach worms) were in the stomach of one of the larger male specimens.

_Specimens examined._--Total, 4, distributed as follows: Los Angeles County: Mescal Canyon, 4800 ft., 1; Graham Canyon, 4700 ft., 1; Grandview Canyon, 5200 ft., 2.

=Felis concolor californica= May

Mountain Lion

Several cabin owners near the mouth of Icehouse Canyon reported seeing a lion in that area in 1950, and others said they saw huge cat tracks in Icehouse Canyon. State Trapper James Wolfort reported that he trapped two lions on the coastal face of the range in 1947. Authentic reports indicate that mountain lions occur in remote sections on both slopes of the range, and in these areas mountain lions probably are as common as they ever were.

Family CERVIDAE

=Odocoileus hemionus californicus= (Caton)

Mule Deer

Mule deer are common in chaparral areas on both slopes of the San Gabriel Mountains. The animals or their tracks have been observed from the coastal sagebrush flats up to about 9200 feet on Mount San Antonio, and on the desert slope down to the lower limit of the juniper belt.

Deer are plentiful in the upper chaparral belt, and large bands are often noted there in spring. These bands may form in the up-mountain migration and reoccupation of areas which were covered by winter snows.

A band of fourteen was observed on March 17, 1951, one mile east of the mouth of Cattle Canyon, and bands of about half a dozen individuals each were often noted in March, 1951, at the base of Icehouse Canyon.

Cronemiller and Bartholomew (1950) gave a good account of the mule deer in the chaparral belt of the San Gabriel Mountains.

On Blue Ridge in the fall of 1951, deer were plentiful, usually being observed near patches of s...o...b..ush and sage. They were seldom found in the coniferous forests. On November 6, 1951, while tending a line of snap traps before sunup, I startled a deer from its bed at one edge of a several-acre patch of s...o...b..ush. In synchrony with the noise made by this deer's rising five other deer in various parts of the brush patch leaped up and made off. When bedded down in these extensive brush tracts deer are probably safe from an undetected approach, for a noiseless approach through the brush is impossible.

Two deer skulls from the San Gabriels were examined: that of an adult male from Evey Canyon, and that of an adult female from the mouth of Palmer Canyon. Using as a basis for comparison the cranial measurements for the subspecies _californicus_ and _fuliginatus_ given by Cowan (1933:326), these skulls were subspecies _californicus_. In none of the cranial characteristics considered did they tend toward the southern race _fuliginatus_. A young adult male, however, which was killed by a car near Cajon Pa.s.s on October 2, 1951, showed pelage characteristics of _fuliginatus_. Its fresh winter pelage was dark, and had the distinct black mid-dorsal line and the broad dorsal line on the tail mentioned by Cowan (_ibid._) as distinguis.h.i.+ng marks of the race _fuliginatus_. Its cranial measurements were not taken. Judging from this limited material the deer in the central part of the range, that is to say, in the San Antonio Canyon region, are of the race _californicus_, while _fuliginatus_ may penetrate the extreme eastern end of the range.

Deer hair and bones were often found in coyote feces from the sagebrush belt. Some of these records may represent deer eaten as carrion. On February 6, 1952, tracks across a sandy channel in San Antonio Wash demonstrated that a deer had been closely pursued by a coyote. The deer had leaped from a cutbank onto the sand, had whirled around in several sharp turns, and had run into the adjacent brush. The tracks of a running coyote followed every twist of the deer's trail. The trail was followed into the brush where it was lost. Two bobcats trapped near Graham Canyon on the desert slope had hair and bones of deer in their stomachs.

_Specimens examined_, 2: Los Angeles County: Evey Canyon, 2100 ft., 1 (PC); Palmer Canyon, 1900 ft., 1 (PC).

Family BOVIDAE

=Ovis canadensis nelsoni= Merriam

Bighorn

Bands of bighorn sheep occur on some of the higher and more rugged peaks of the San Gabriel Mountains. Although I never sighted the animals themselves, I have seen abundant signs of their presence on the ridge sloping west from Telegraph Peak at about 9000 feet elevation. Several bands reportedly range in the head of San Antonio Canyon, and to the south on Telegraph, Ontario, and Cucamonga peaks. The sheep usually stay in the higher sections of the range, generally above about 7000 feet elevation. According to district Ranger A. Lewis some bighorns summer in the lower East Fork of San Gabriel Canyon. The subspecific status of the bighorns in the San Gabriel Mountains has not been definitely determined. Following Grinnell (1933:211) they are here referred to _nelsoni_. If the band can be preserved without introduction of "alien"

stock, the United States Forest Service and the California Fish and Game Commission will have registered an achievement that will be applauded by all persons who are interested in American wildlife.

LITERATURE CITED

BENSON, S. B.

1930. Two new pocket mice, genus _Perognathus_, from the Californias. Univ. California Publ. Zool., 32:449-454.