Evidence of nesting is easy to see. A bird carrying either vegetation or food means that they are building a nest or feeding young. And observing a recently hatched bird confirms that a nest was successful.

Migration takes many forms. Of course there are new arrivals that interest us, and of course there are transients that are passing through, but there are also late individuals that probably should have already migrated further north.

Abundant bright yellow birds means that it is the season for northbound migrating warblers. This is an exciting time to look for birds as we do not know what is around the next corner and their bright colors and loud singing makes their identification easier.

Brightly colored birds have arrived in various shades of blue, green, yellow, rufous, gray, brown, orange, black, red and white.

Some brightly colored birds (orioles, tanagers and grosbeaks) are now migrating north through Central America. And storms cross from the Pacific Ocean to the Gulf of Mexico before making their way northward to us.

The first singing American robins are eagerly anticipated every spring. Ten robins were loudly and continuously singing at my house on April 4, on a day where temperatures approached 70 degrees.

If we drink salt water we get thirstier. But not birds. Some birds — albatrosses, shearwaters, penguins, gulls and pelicans — can drink salt water!

There are several species that everyone enjoys seeing in the spring as it signals better weather is coming.

Our spring equinox, the start of the astronomical spring, comes on March 20 at 5:01 a.m. (I have not researched how they come up with the exact to the minute 5:01 time).

Many people are still feeding birds since influential organizations believe that it is safe to feed birds as the bird flu does not commonly infect songbirds.