thats an 88% mortality. robins live up to 5-7 years in the wild but 3-4 years in captivity. Robins have been known to nest in some weird and wonderful places, from post boxes to unused barbeques! Adult survival rates are usually between 0.4 and 0.6 with first-year
Woodland Trust (Enterprises) Limited, registered in England (No. The opposite of mortality is survival. //-->, How long does a bird live? (populations usually fluctuate about an average); so if there was a pair in your garden
Life is more challenging for a bird with one leg. Ornithologists usually use the second one
Big birds, seabirds and tropical birds can
Images Copyright 2003 Offwell
is ten or twenty times as much as the average individuals so its easy to see
Pairs usually remain together during an entire breeding season, which can involve two or three nestings. A. here), so for us to have two birds again this year 1.2 (2 minus 0.8) birds must have
It’s no wonder this fiery little fella is one of Britain’s most-loved birds, frequenting the UK’s gardens in search of worms. American Robins often find worms by staring, motionless, at the ground with the head cocked to one side. Generally, large birds and seabirds live longer than small birds. Autumn leaf identification quiz: can you identify these 10 trees? Iconic. So: So how many have died? years! thought, but this has to happen if the population is to remain roughly constant. Robins are widespread and their population is thought to be stable. Or, enjoy a walk around your local wood and you could see one perched on a branch, perhaps even singing their silvery song. Images © protected Woodland Trust. that are used for calculating life expectancy: the first one is more straightforward: So if the mortality is 0.6 (as it is for adult Robins) then
But by the start of the next
About 12-14 days after the last egg was laid. A. After leaving the nest (fledging), it takes another 10-15 days for babies to become strong fliers and independent birds. Of those that survive their first year, most wild robins live to be about 5 or 6. And what to do with them. The female robin builds a cup-shaped nest using moss, hair, grass and dead leaves, somewhere on or close to the ground. In long grass, robins may hop or fly just above the ground powered by slow, powerful wingbeats. You can help robins build up their fat reserves during the winter by putting bird food, such as mealworms, on your garden bird table – they are a favourite for robins. Which one is correct? But in the mean time that original pair has had,
will be alive this year (yes, 0.8 of a bird is nonsense but we are talking about averages
2296645), is a wholly owned subsidiary of the Woodland Trust. because it fits into several other equations that are used in studying bird populations. Ringing studies have shown that the first year mortality of young
So out of twelve (2+10)
1-0.6) and the life expectancy is 1.1 years. However, in spring, sometimes a male and female who mated the previous year will both return to the same territory and end up together for another year. Both can be written as a percentage or as a
say, two broods of five young - that is ten new Robins. Types of mushroom in the UK: common identification guide, When do pine cones fall? We can now answer the question, for Robins at least. Of those that survive their first year, most wild robins live to be about 5 or 6. Albatrosses live so long that it is hard to calculate their survival rates - they can live
Woodland & Wildlife Trust. fraction of one, for example a mortality of 83% can also be written as 0.83 and usually in