Zebra finches and sounds, new research


This video says about itself:

26 November 2015

Researchers said zebra finch pairs appear to ‘discuss’ their parental duties. If one of them is late they ‘negotiate’ how long the other should spend away from the nest when they go foraging.

From Leiden University in the Netherlands:

Male birds may sing, but females are faster at discriminating sounds

Published on 12 May 2016

It may well be that only male zebra finches can sing, but the females are faster at learning to discriminate sounds. Leiden researchers publish their findings in the scientific journal Animal Behaviour.

The scientists reached this conclusion after a meta-analysis of different experiments with the songbirds. Combining the results of 14 separate studies gave them a population of 87 birds to work from. The aim of the research was to find out why some birds could recognise sounds faster than others.

Go and no-go

The zebra finches heard one of two sound types after pecking at an LED sensor. If – after hearing the right sound (the ‘go sound’) – they pecked on the sensor again, they received a reward. Pecking on the sensor after hearing the so-called no-go sound gave them no reward, and even ‘punished’ the birds by leaving them in the dark for a short while.

Dr Pralle Kriengwatana: ‘Our meta-analysis shows that female zebra finches learn to discriminate sounds faster, which is surprising considering that females don’t sing. On the basis that male songbirds usually sing more than female songbirds, scientists have long assumed that the males must also be better at recognising and learning song (and perhaps also other sounds). It now seems that sex differences in producing complex sounds do not necessarily correlate exactly with the ability to perceive and discriminate these complex sounds.’

Cause unknown

The scientists are still in the dark about the reasons why females learn better than males, although the female hormone oestrogen may play a role. According to Kriengwatana, further research is needed to determine the precise cause of the sex differences.

The researchers also discovered that the zebra finches try out different theories in their efforts to understand the test. In the first instance some birds stop pecking as soon as they hear new sounds, and then start pecking after each sound (both ‘go’ and ‘no-go’). Once they realise that pecking after the ‘no-go’ sound does not bring them any reward, they peck much less after this sound. The other group of birds also initially stop pecking, and then slowly but surely start pecking on the LED sensor again after both sounds. As soon as they understand that the ‘go’ sound gives them food, they peck more after hearing this sound.

Family size and body mass

Surprisingly enough, family size and body mass also seem to play a role. The finches from larger nests learned to distinguish sounds faster than birds with fewer siblings. The same applied for finches that weighed more at the age when they learned to eat by themselves and stop relying on parents for food. One explanation could be that more contact with other birds and better health may promote the faster recognition of sounds.

Mammoth fur, excrement in Dutch museum


This is a 29 April 2016 video from Naturalis museum in Leiden, the Netherlands. It shows pieces of woolly mammoth fur and excrement arriving in the collection, all the way from the permafrost in Siberia.

Museum biologists at work, video


This 7 April 2016 video from Leiden in the Netherlands is called At the laboratories of Naturalis Biodiversity Center.

Schoolchildren learn at botanical garden, natural history museum


This 29 March 2019 Dutch video is about school children in Leiden city, the Netherlands. The video shows how they learn in the local botanical garden and local museums, especially Naturalis museum.

Spoonbills nesting in Leiden, the Netherlands


This video shows an Eurasian spoonbill (and grey lag geese) in Hlohovec (Czech Republic).

There are big spoonbill nesting colonies in the Netherlands. Like in De Geul nature reserve on Texel island with hundreds of nesting couples.

Some Dutch spoonbill colonies are much smaller.

This blog already reported that in 2014, there were three spoonbill nests in the grey heron colony in Cronesteyn park in Leiden.

And in 2015, again three spoonbill couples nested there.

Will they do that again this year?

Wildlife Photographer of the Year exhibition


This Dutch video says about itself (translated):

On Saturday, March 5 2016 opened the exhibition Wildlife Photographer of the Year. The winner of the Wildlife Photographer of the Year competition 2015 Don Gutoski [from Canada] told in Naturalis museum about his winning photo. The photo exhibition will run until Sunday 29th May. Wildlife Photographer of the Year was developed and produced by the Natural History Museum, London. More information is here.

Pro-refugee demonstration, Leiden, the Netherlands, 1 March


This video from England says about itself:

12 September 2015

On the day he was elected leader of the Labour Party, 12 September 2015, Jeremy Corbyn spoke at the huge demonstration in London at which over 100,000 people expressed their solidarity with refugees. It was his first public appearance after he won the leadership vote.

On Tuesday 1 March, the local council in Leiden, the Netherlands, will decide about housing refugees who have been recognized as such by the government.

The organisation Doorbraak organises a pro-refugee demonstration on the square outside the local council building, the Stadhuisplein. From 7pm till 9 pm.