A deserted miner's cabin is briefly illuminated by autumn sun in Colorado's San Juan Mountains.

A deserted miner's cabin is briefly illuminated by autumn sun in Colorado's San Juan Mountains.

 Egyptian Fruit bats roost in caves, but they were also found roosting in the passageways of the Pyramids of Giza when the tombs were opened in 1810. They weigh less than half a pound but have a wingspan of about 2 feet.

Egyptian Fruit bats roost in caves, but they were also found roosting in the passageways of the Pyramids of Giza when the tombs were opened in 1810. They weigh less than half a pound but have a wingspan of about 2 feet.

 In 1974 a University of Hawaii student released eight gold dust day geckos into the upper Manoa Valley of Honolulu. These geckos are native to Madagascar and were previously unknown to Hawaii. Now they are ubiquitous on the islands.

In 1974 a University of Hawaii student released eight gold dust day geckos into the upper Manoa Valley of Honolulu. These geckos are native to Madagascar and were previously unknown to Hawaii. Now they are ubiquitous on the islands.

 A queen butterfly sips nectar  from a flower in the Lower Rio Grande Valley of Texas.

A queen butterfly sips nectar  from a flower in the Lower Rio Grande Valley of Texas.

 A Bullock's Oriole perches on a log at the National Butterfly Center in Texas' Rio Grande Valley 

A Bullock's Oriole perches on a log at the National Butterfly Center in Texas' Rio Grande Valley 

 High above the vast San Rafael Valley in the Borderlands of Arizona

High above the vast San Rafael Valley in the Borderlands of Arizona

 My old girl, Eleanor.

My old girl, Eleanor.

 A green jay eats seeds in the Lower Rio Grande Valley, Texas.

A green jay eats seeds in the Lower Rio Grande Valley, Texas.

 An aspen grove displays its autumn foliage in Colorado's San Juan Mountains.

An aspen grove displays its autumn foliage in Colorado's San Juan Mountains.