Grey Wagtail
Motacilla cinerea
A Grey Wagtail displaying its classic slate-grey back and vibrant yellow underside.
Quick Classifications & Status
- Family: Motacillidae (Wagtails and Pipits)
- UK Status: Amber list (Resident year-round)
- Key Features: Long tail, slate-grey upperparts, bright yellow underparts, and a clean white throat.
Field Identification & Behavior
Gray wagtails are mainly water-environment based birds, and they are colourful indeed. Their underbelly is a beautiful, vibrant yellow and their hunting style is highly acrobatic. Despite some part of them being yellow, they aren't all vibrant. Their upper body are a striking blue-gray, including their head, back and wings. Their tail is also exceptionally long, narrow, and black-and-white. True to their name, Gray wagtails walk with a continous 'wagging' of their tail, and research says this bobbing is a sign of vigilance, because they believe they are impossible to ambush!
Gray wagtails primarily eat midges and ants, and small aquatic 'invertebrates' (a water animal that has no back). They glide across rocks and fly up soaring into the air, using their long tails as a sort of rudder!
Unlike other wagtail species, gray wagtails are often seen alone or in pairs, and do not form large roosts. They do this to defend their stretches of water, often having fierce rivalries about it!
Fun fact: They have the longest tail of any European wagtail!
Preferred Habitats
Gray wagtails are very dependent on rushing freshwater environments like rivers, rocky streams, and fast waterfalls (especially during the spring and summer!) They need big boulders and gravel beds to use as hunting platforms to spot insects, their favourite food!
Gray wagtails frequently occupy bridges, especially those made of stone, dams, disused and rundown watermills, and often weirs too, mainly for foraging and shelter.
In the winter, many water treatment plants become bombarded with gray wagtails because they are a prime habitat! But you may ask, why do they become prime habitats? Because of the high concentration of insects! Gray wagtails also find it very easy to adapt to concrete-sided canals, culverts (particularly in cities) and large garden ponds. They build nests in hidden cavities (that we would never be able to get into!), tree root hollows, and even gaps in rock faces, and their nests are almost always located within a few metres of active, running water to ensure a quick food supply for their little chicks.
During summer, many gray wagtails stay exclusively in upland or mountainous regions, because of the rapid water flow. They also undergo something called an 'altitudal migration, moving from high-positioned streams to low-lying coastal areas, and sometimes even farmyards during the coldest months!
Listen to the call: You can hear real community recordings of their sharp, metallic flight calls directly on the volunteer archive Xeno-canto. The call sounds like a crisp, sharp "zi-zit" or "t-zick". You can view a visual graph of the sound waves by clicking the [sono] button next to any recording on the archive site.