Click the photos to leave a comment or to see the answers to the questions.

Answers to new photos are posted the next day.

Another garden challenge. Nancy found this creature in our garden. What should you do if you see one of these?

The cliffs behind our house were once part of an erg. Without looking it up, what is an erg?

Another potential garden visitor. If you see one of these in your garden, what should you do?

This is a grain of salt, photographed with my new microscope. Why are grains of salt cube-shaped?

Nancy found this strange looking insect today. If you see one of these in your garden, what should you do?

This is a new visitor to our garden. It is a Broad Tailed Hummingbird. They are known for philopatry-faithfulness. Without looking it up, what is philopatry-faithfulness?

There is an easy way to tell if this bird has a mate or not. What is it?

We found this clump of strange, yellow-green leaves on a nearby juniper tree. What caused it?

This bird is well known for a specific adaptation. What is it?

These beautiful birds have returned to our garden for the summer. What is unusual about the way this bird molts?

Why do cats often wiggle their back legs just before they pounce on their prey?

Nancy and I found this on our hike yesterday. What is it?

Is it a bad idea to feed bread to birds?

This is Glen Canyon Dam in Page, Arizona. It is a hydroelectric dam, converting the potential energy of the lake water into electrical energy. Energy does not just appear out of nowhere, so the potential energy of the lake water had to come from some other energy source. What is that source?