Survival of the Fittest

Wednesday, May 8th 2013

Do you remember these owlets from the blog post on 29th April?


Because Tawny Owls lay their eggs over a period of several days, the hatching is also staggered. This means that there is always a difference in the size of the chicks in the nest, the larger and more active individuals invariably getting more food from the parents than their smaller, weaker siblings. As a result, it is rare for all the chicks that hatch from a clutch to survive unless there is an abundance of food. Often the youngest chicks starve, or are sometimes even eaten by their siblings. This may seem cruel but this method of rearing of young ensures that, whatever the food availability, some offspring will always survive and produce further offspring. If all the young were fed equally there would be a chance that all might starve in years of poor food supply. So when the box was re-visited yesterday, it was no surprise that there was only one large healthy chick.

Healthy owlet

This was ringed and then carefully returned to the nest box.


The moth trap was set last night and produced 41 moths of 7 different species (Early Grey, Hebrew Character, Common Quaker, Powdered Quaker, Twin-spotted Quaker, Clouded Drab and Small Quaker.

(0) Comments:

There are no comments for this blog post yet. Why not start the discussion? - use the form below:

Leave a Comment:

Remember my personal information

Notify me of follow-up comments?

The following question is designed to make sure you are a real person and helps us cut down on spam.
Your comments will appear here once an administrator has reviewed them.

How many hours in one day? (2 character(s) required)

Back to Top

Recent Blog Posts:

Net ride management 2017/18

Posted 22nd March 2018

Net rides again folks!  Over the last few volunteer days we finished tidying up net ride 34 and proceeded to cut net ride 38; today…

Read More

Officially Spring!

Posted 21st March 2018

Not only is it the Met Office spring, it is also the spring equinox spring!  So before setting out for our walk we wrapped up…

Read More

Tree Thinning Completed

Posted 20th March 2018

Work on thinning one area of young woodland has been completed today with four volunteers working to reduce the competition from Birch, Bramble and Gorse…

Read More

The Effects of Snow and Ice

Posted 19th March 2018

The second spell of cold weather is now gradually passing, the thin layer of snow is melting and things are warming up.  Lark and Taurus…

Read More

Sitemap | Accessibility Policy | Privacy Policy | Terms & Conditions |