How Birds Change in Spring

How Birds Change in Spring

Spring is a season bursting with changes as the days lengthen, temperatures warm, and hibernating wildlife wakes up. Birds change in many ways during spring as well. Birders who watch for these seasonal changes will better appreciate the adaptability and yearly cycle of the birds they see.

When Is Spring for the Birds?

We may celebrate the first day of spring on March 20th, but spring varies for birds. It depending on their location and local geography. For birds in southern areas where the climate is naturally milder, spring-like conditions may occur as early as mid-February. In northern areas with longer, stronger winters, however, it may not feel like spring until as late as mid-April or early May. Thanks to the moderating effects of the ocean, coastal areas often experience spring sooner than inland regions, while mountain areas find spring later on the calendar.

Wherever they are, birds note the shifting season in different ways. Changing light levels and longer daylight hours are their biggest clues. Changing food sources and weather patterns also give them indications that spring has arrived.

8 Ways Birds Change in Spring

As the season changes, birds change as well. While different birds change in different ways as the season advances, many birds will:

1. Change Their Appearance

Brighter feather colors and elaborate plumes are popular feathered fashions in spring. Some birds molt in late winter so they are wearing their freshest plumage when spring arrives, while others molt in late summer but wear off the duller, outer edges of their feathers over the winter so they are showing their brightest colors in spring. Many birds also grow long plumes or specialized feather shapes to attract the attention of prospective mates.

Betty Wills
Betty Wills [CC BY-SA 4.0 (]

2. Find Their Voices

While birds may sound different calls and alarms year-round, their most elaborate, impressive songs are often reserved for spring. They may sing far more frequently throughout the season. Those songs help birds claim and defend territories, as well as impress mates. Even birds that don’t typically sing, such as sage-grouse and woodpeckers, use other noisemaking means such as pounding air sacs or drumming on resonant surfaces to spread the word of their spring availability.

3. Break Up Flocks

While spring is the time when birds may be starting their families, other flocks will break up as spring arrives. Birds that gathered together for safety in numbers throughout the winter will split up as they seek out individual mates. Family flocks that stayed together for months after the last nesting season will break apart as juvenile birds seek out their first mates.

Image by Lukas Bieri from Pixabay

4. Start Dating

Even as bird flocks break up in spring, individual birds are getting into the feathered dating scene. Different birds may temporarily gather in communal leks to strut their stuff and choose mates, while dancing, songs, acrobatic flights, food gathering, mutual preening, and other tactics are put into play as birds try to impress the strongest, healthiest mates.

5. Change Their Diets

Many people change their diets in spring. Fresh foods become available, or we hope to lose weight before swimsuit season. Birds also change their diets as the season changes. Birds tend to eat more insects in spring as bug populations rise, and birds will also seek out sources of calcium in spring as they get the urge to lay eggs. Both those dietary changes help foster healthier chicks with strong growth and development.

Carolina Chickadee
A nesting Carolina Chickadee will collect more than 400 caterpillars each day. The bugs are packed with nutrients like carotenoids that growing chicks need to thrive. Photo: Douglas Tallamy

6. Grow More Aggressive

Some birds get decidedly more aggressive in spring. They chase away other birds they may have ignored or even cooperated with previously. Competition can be fierce for the best nesting sites and feeding grounds, and birds feel compelled to defend their territories in order to attract the best mates and improve their chances for passing their genes on to the next generation. This aggression can even be seen when some birds attack their reflections in mirrors, windows, and other shiny surfaces, mistakenly believing those reflections to be intruders.

Rosemary plant
Grow More Aggressive

7. Grow More Secretive

Not all birds get aggressive in spring, and in fact, some species grow more secretive as nesting season approaches. This is especially critical for birds that nest on the ground, as they must be very wary in order to conceal their nests and protect their eggs and chicks from predators. To do this, these birds may become quieter and stay tucked into dense foliage and thickets, preferring to stay in protected areas rather than venture out where they may be noticed. While this can make seeing these birds more difficult, it does help to ensure there will be broods of baby birds to enjoy later in the summer.

8. Become Architects

Birds don’t fuss with building shelters throughout the year, but during the spring it is important to construct the perfect nest for cushioning and protecting eggs. To do this, birds will select only the best nesting materials, and may spend hours or days weaving, layering, and adjusting their nests. Some birds even decorate their nests with bits of moss, lichen, leaves, and other materials that help conceal it and reinforce its edges. For some birds, this nest construction starts well before eggs are laid. Male birds may begin nest-building as part of their strategy to attract a willing female. Still, she’ll often redo their handiwork to suit herself even if she finds the mating acceptable.

With so many changes occurring throughout the season, there is always something new and interesting to see and enjoy with spring birds.


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