Category Archives: Mammals

Bergmann’s Rule

This gallery contains 2 photos.

Bergmann’s Rule (the third ecographic rule) was formulated in 1847 by Karl (also seen as Carl) Bergmann (1814 – 1865), a German biologist. It states that the same or closely related species tend to be larger in colder climates. It … Continue reading

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Allen’s Rule

This gallery contains 2 photos.

There are three principal Ecographic Rules for terrestrial environments: Allen’s Rule, Gloger’s Rule and Bergmann’s Rule. Ecographic Rules are concerned with variations in traits (mainly morphological) of organisms over goegraphical gradients. Allen’s Rule was discussed previously. (see “Gloger’s Rule” 10-10-16) … Continue reading

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Yellowjacket Nest

This gallery contains 4 photos.

This month Leonard and I were walking at Little Lavas near Modoc National Forest Road 56 (Modoc County CA) when we came across a underground nest dug up by some animal. The papery combs were scattered around the underground hive … Continue reading

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Are You My Mother?

Throughout the summer a mule deer (Odocoileus hemionus) doe and her fawn visited our yard (near Lookout CA, Modoc County) almost every day. (see “Mule Deer Fawn” on 08-13-2013) They made the rounds eating our pear and plum trees, grape … Continue reading

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Bobcat

Bobcats (Lynx rufus) have well-defined territories marked with urine scent, feces and clawing. Males will tolerate other males where their territories overlap, but females generally do not permit other bobcats to trespass. Each bobcat has several areas within its territory … Continue reading

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Mule Deer Fawn

This week I noticed a mule deer fawn (Odocoileus hemionus) outside my study window. On the other side of the fence was the fawn’s mother. The fawn was agitated because it could not jump over the fence, even though the … Continue reading

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Resident Skunks

Striped skunks (Mephitis mephitis) live in holes dug into the ground, often under old buildings and rock piles. For years, skunks have lived under an old bunkhouse about ten feet from our front door (near Lookout CA – Modoc County). … Continue reading

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