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Author: Les Underhill

Prof Les Underhill was Director of the Animal Demography Unit (ADU) at the University of Cape Town from its start in 1991 until he retired. Although citizen science in biology is Les’s passion, his academic background is in mathematical statistics. He was awarded his PhD in abstract multivariate analyses in 1973 at UCT and what he likes to say about his PhD is that he solved a problem that no one has ever had. He soon grasped that this was not the field to which he wanted to devote his life, so he retrained himself as an applied statistician, solving real-world problems.
Arrival and peak abundance of Barn Swallows
Archive/Bird ringing/Birds/Citizen Science/Data and statistics/Migration

Arrival and peak abundance of Barn Swallows in three regions of South Africa in relation to climate indices, deduced from SABAP2 data

Posted on 26/09/2025 by Les Underhill

A paper on the migration of Barn Swallows has been published Open Access in the journal Birds. Publication date was 9 September 2025. The authors, title and jou...

Archive/Biodiversity/Bird ringing/Birding/Birds/Citizen Science/Vanrhynsdorp

Bird ringing at Botuin, Vanrhynsdorp : 23 to 27 August 2025

Posted on 28/08/2025 by Les Underhill

We were bird ringing at Botuin, Vanrhynsdorp, at the peak of the spring wildflower season. We didn’t do any dedicated trips to the special touristy flower...

Archive/Bird ringing/Birding/Birds

Bird ringing at Alte Kalköfen Bird Observatory : 5 to 12 February 2025

Posted on 18/08/2025 by Les Underhill

Where is the Alte Kalköfen Bird Observatory? The Alte Kalköfen Bird Observatory is in southern Namibia, along the B4, the main road between Keetmanshoop, via Au...

Archive/Biodiversity/Bird ringing/Birding/Birds/Citizen Science/Trip report

Bird ringing at Nuwejaars Wetlands SMA : 9 to 14 August 2025

Posted on 15/08/2025 by Les Underhill

This is a report on our seventh bird ringing expedition to the Nuwejaars Wetlands. We were here from Saturday 9 to Thursday 14 August 2025, five nights. This se...

Archive/Bird ringing/Birding/Birds/Citizen Science

Bird ringing and brunch at Zandvlei : 21 December 2024

Posted on 24/07/2025 by Les Underhill

On Saturday 21 December 2024, we invited all the bird ringers in Cape Town to celebrate a year of enjoying birds. It was an special opportunity for the bird rin...

Archive/Biodiversity/Bird ringing/Birding/Birds/Citizen Science/Site report/Vanrhynsdorp

Bird ringing at Botuin, Vanrhynsdorp : 29 March to 4 April 2025

Posted on 13/07/2025 by Les Underhill

We had neglected our Vanrhynsdorp ringing sites since November last year, so this visit was overdue! You can read the report on that trip here. This blog summar...

Archive/Biodiversity Observations/Site report

Researcher heaven : publications on biodiversity on Robben Island

Posted on 01/07/2025 by Les Underhill

Imagine. You are a new postgraduate student on Robben Island. You know you have lots of predecessors, and that you need to read up on all the research has alrea...

Archive/Biodiversity/Bird ringing/Birding/Birds/Citizen Science/Karoo

Bird ringing course at New Holme : 9 to 15 September 2024

Posted on 01/07/2025 by Les Underhill

The BDI’s ninth bird ringing course, and the fourth at New Holme, was held at the New Holme Nature Lodge, in the heart of the Karoo, between Hanover and C...

male southern red bishop
Archive/Bird ringing/Birding/Birds/Vanrhynsdorp

Bird ringing course at Botuin, Vanrhynsdorp : 15 to 20 November 2024

Posted on 30/06/2025 by Les Underhill

The BDI’s 10th bird ringing course was held at Botuin, Vanrhynsdorp, from 15 to 20 November 2024. We have a selection of ringing sites in the district, wh...

Archive/Biodiversity/Bird ringing/Birding/Birds/Citizen Science/Trip report

Bird ringing at Nuwejaars Wetlands SMA : 7 to 11 April 2025

Posted on 06/06/2025 by Les Underhill

Expedition number five to the Nuwejaars Wetlands SMA. Our accommodation was in the delightful units at Hazevlakte. We arrived Monday 7 April, put up nets in the...

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  • Home
  • Departments
    • Research Training
      • Introduction
      • Research Themes
      • Study Sites
      • Logistics
    • Bird Ringing
      • Introduction
      • Ringing history
      • The Value of Bird Ringing
    • Science and Ecology Specialist Consulting
    • Citizen Science – Biodiversity Conservation & Research
    • Biodiversity Observations
  • About
    • What we do
    • Who we are
    • Contact us
  • News
    • Archive
    • BDI Research
    • BDI Bridge
    • BDInsight
  • Upcoming BDI events
  • Biodiversity Projects
    • Bird Feeder Project
    • Atlas of Frogs & Toads
    • Atlas of African Neuroptera and Megaloptera
    • Atlas of Dragonflies & Damselflies
    • Atlas of Butterflies & Moths
  • Karoo Research Centre

Recent posts

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    Cover image of Scaly-feathered Finch by Kyle […]
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  • Acacia Pied Barbet (Tricholaema leucomelas)
    Cover image of Acacia Pied […]
  • Yellow Canary (Crithagra flaviventris)
    Cover image of Yellow Canary by Lance […]
The Biodiversity & Development Institute is a non-profit company registered with the Companies and Intellectual Property Commission of South Africa (CIPC), Reg. No. 2015/136344/08.
Registration in terms of the Non-Profit Organisations Act: 302-671 NPO.


Directors:
Prof Les Underhill, Ms Sue Gie, Jorn Das
les@thebdi.org
072 062 1140


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Old Farm Road, Rondebosch, 7700, Western Cape, South Africa
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