Ronny Steen

13 Questions 45 Answers 0 Followers

Questions related from Ronny Steen

Finding the "right" time gap (hit window) for camera trap data - what is the best procedure?

For many camera trap studies it is a problem that it is not possible to distinguish individuals, therefore consecutive visits may be the same individual. Either an individual triggers a burst of...

02 April 2020 4,586 1 View

How to estimate animal home range and habitat selection for a terrestrial bird inhabiting the coast and group of islands surrounded by the sea?

Hi, I have a set of GPS fixes from GPS tagged owls. The GPS was programmed to send 3 GPS positions (fixes) during the night (2 hours before midnight, midnight and 2 hours after midnight). The GPS...

03 November 2017 6,620 12 View

Suggestion for trail camera software for photo management and sharing with students?

I wish to use trail cameras in my teaching. The course is about vertebrates and the images from the trail cameras will be a learning resource among others. The main goal is that the students learn...

12 December 2016 800 7 View

Horned Sungem (Heliactin bilophus) has the fastest wingbeat per s during hovering according to internet - any scientific publications confirming this?

According to different internet sources The Horned Sungem (Heliactin bilophus) is reported to have the fastest wingbeat per second in hummingbirds during hovering. It can make 90 wingbeats per...

06 November 2016 2,122 1 View

Can someone help with identifying colors in images of one individual bird?

The images of interest is of a individual Eleonora's falcon. This species comes in different color morphs. 1. Light morphs (Male: yellow-greenish color around eyes and at the naked skin above the...

21 December 2014 3,495 17 View

How to measure the level of camouflage?

I have a set of photos of birds and I wish to create an index on how well they blend into the background or in other words how much their colour and pattern deviates from their background. Is...

29 July 2014 397 39 View

What is the highest wingbeat frequency recorded for hummingbirds during hovering?

What is the highest wingbeat frequency (WBF) recorded for hummingbirds during hovering? To my knowledge the highest is 80 wingbeat per sec for the Bee hummingbird (Calypte helenae) (Greenewalt...

22 May 2014 9,240 2 View

What is the best approach to analyzing circadian activity (24 hours): cosine curve fitting or GAM?

I have recently started analyzing animal circadian activity (24 hours). I started my analyzes with the use of GAM (or more precise GAMM, with random term (animal ID)). However, I'm now aware that...

15 May 2014 6,991 18 View

Can anyone identify this hummingbird species?

We need help in identification of a hummingbird filmed in Mindo, Equador (February), see attached picture and video: https://www.youtube.com/watch?v=7PH-ab0J6Gs We do think that it is a...

04 May 2014 2,351 6 View

Is there any information about which Dodecanese Islands (Greece) are important as a stopover for autumn migratory birds?

I try to find information about which Dodecanese Islands (Greece) are important as stopovers for nocturnal autumn migratory birds. I will try to relate this to the diet of the Eleonora's falcon....

09 March 2014 3,604 4 View

How can I age nestling Eleonora's Falcons (Falco eleonorae) based upon close up footage?

I need help with ageing of nestling Eleonora's Falcons (Falco eleonorae) based upon close up photos. Unfortunately I don't have biometric measurements. I would be happy if someone has a reference...

27 February 2014 2,256 10 View

Will colour rings work for the Eurasian Jay (Garrulus glandarius)?

I´m carrying out a study of wild Eurasian Jays, and to keep a track on individuals I will use colour rings of this type: http://www.achughes.com/N2FB.html . However, I am a bit concerned that the...

07 December 2013 574 3 View

Advice for references on optimal foraging in hawk-moths feeding on Orchids?

During my studies of pine hawk-moths (Hyloicus pinastri) feeding on greater butterfly-orchids (Platanthera chlorantha); I observed that the initiation of the probing started mainly at the...

03 July 2013 3,609 3 View