Sand Martin Diet and Size: Feeding Habits, Predators, and Measurements
Sand Martins are the smallest members of the Swallow family that visit the UK. They typically arrive in March and breed in the UK and other parts of Europe before returning to Africa where they over winter.
These interesting little birds have brown backs and heads with a white underbelly, sharp triangular wings, forked tails, large black eyes, short greyish legs and a black straight bill.
In this article we’ll be looking at the diet, breeding habits, the size and weight of the Sand Martin and much more besides. Keep reading to find out more.
Table of Contents
The Dietary Habits Of The Sand Martin
Sand Martins forage for food whilst flying and they can often be seen skimming close to water or over fields catching insects. Their speed and agility help them capture their prey quickly and efficiently.
What Does A Sand Martin Eat?
The main source of food for the Sand Martin are insects which they catch whilst flying. Their diet mainly consists of small flying insects such as; flies, midges, mosquitoes, beetles, flying ants, bees, wasps, dragonflies, damselflies, butterflies and moths.
What To Feed A Baby Sand Martin?
The parents will catch smaller insects like flies, mosquitoes and beetles and take them back to the nest to feed to the younglings. They will often gather several insects in their beaks which they turn into balls to feed their chicks.
This protein rich diet is essential for the growth and development of the chicks. Both adults will continue to feed their chicks until they fledge at around 18 to 22 days after hatching.
Breeding Habits Of Sand Martins
Male Sand Martins perform aerial displays to attract females. They will fly in circles at great speeds and perform aerobatic manoeuvres near to their nesting site. They will also use a simple song which is a series of twittering notes which can be executed during flight or when perched close to the nesting site.
The male will often begin digging out a burrow to attract the female. This burrowing effort shows the female that the male is ready to breed and is serious about raising a family.
Do Sand Martins Mate For Life?
Sand Martins don’t necessarily mate for life. However, they do form monogamous relationships that last for a whole breeding season. They will often go on to raise 2 broods during the season.
The following breeding season, the pair will mate with different partners and form a new season-long monogamous partnership.
The Size & Weight Of Sand Martins
Sand Martins are around the same size as House Martins but can be distinguished by their plain brown backs and heads and pale undersides.
How Much Does A Sand Martin Weigh?
Sand Martins typically weigh around 13 to 14 grams which makes them one of the lightest members of the Swallow family. Their small size and lightweight build help them in their agile flights and aerial lifestyle.
How Big Is A Sand Martin?
The average length of an adult Sand Martin is around 12 cm from the tip of their bill to the end of their tail. They have a wingspan of around 26 to 29 cm.
Are Sand Martins Under Threat?
Sand Martins are not considered to be under threat globally, in fact, the International Union for Conservation of Nature (IUCN) have classified them as a species of least concern. This means they are not considered to be globally endangered.
Having said that, like all birds, Sand Martins do face certain challenges to their survival. These include; habitat loss due to riverbank erosion, flooding or human activities, climate change which can affect breeding success or a lack of food, pollution and pesticides which reduce the number of insects that Sand Martins rely on for food.
As well as disturbance by humans either by extraction of sand or recreational use of riverbanks etc.
What Eats A Sand Martin?
Sand Martins can become prey to birds such as Kestrels and Sparrowhawks as well as mammals like rats and foxes which are a particular problem in nesting sites and will take eggs and chicks as well as adult birds.
Where Can I See Sand Martins In The UK?
Sand Martins can be seen in various parts of the UK during the breeding season which typically runs from April to September. They frequent many different areas including;
- River Thames (Sand martins are often spotted along the banks of the Thames especially in sandy or gravelly cliffed areas)
- River Severn (Particularly along the sandy banks)
- Coastal Cliffs ( look for sandy or eroded coastal cliffs mainly along southern or eastern coastlines)
- RSPB Minsmere (Suffolk)
- RSPB Sandwell Valley (West Midlands)
- Leighton Moss (Lancashire)
- Rutland Water (Leicestershire)
- Chew Valley Lake (Somerset)
Other suitable sites include gravel pits and disused quarries as well as Sand martin walls which are artificially built to encourage nesting. These artificial walls can be found in various reserves and parks and give you the chance to observe Sand Martins up close.
They can also sometimes be found in urban sites and they will use drainage pipes or crevices in buildings as nesting sites.
The best time to see Sand Martins is during spring and early summer as they are most active during the breeding season. After the breeding season ends, they gather in large flocks before migrating south.
SEE ALSO: Smew Diet and Size: Feeding Habits, Predators, and Measurements
Frequently Asked Questions
Sand martins remain in a monogamous relationship for the duration of the breeding season. But the following year both partners will mate with a different partner and form another season long monogamous relationship.
The average weight of an adult Sand Martin is around 13 to 14 grams.
The length of a Sand Martin is around 12 cm with a wingspan of around 26 to 29 cm.
No, Sand Martins are not UK resident birds. They are summer migrants that come to the UK and Europe to breed. At the end of the breeding season, they fly south to Africa where they overwinter.
