Earth Notes: Bats at the Hogsmill Bridge, Villiers Road, Kingston

Introduction

It is interesting to know when bats are active in terms of times of day and temperatures (hypothesis: from ~20 minutes after sunset and ≳10°C). This set of samples extracted from the wider set of observations in Bats Around our Home aka 16WW, initially on 2025-10-29, at that point extending back exactly five years.

Almost all of these observations are directly by Damon Hart-Davis when passing over the bridge on other business. A few are planned observations and/or by other people.

Methodology

For these Villiers Road Hogsmill Bridge observations, the sampling times are usually when Damon Hart-Davis is passing on foot, such as on the way to or from a meeting. If there is no reasonable chance at all of a sighting, eg broad daylight, no observation will be made. If not feeling like making an observation for whatever reason, then no observation will be made. Bats will be reported as seen or not seen (plus occasional heron etc) as objectively as possible, ie negative and positive results are reported fairly. Reports are not omitted post hoc if bats are not seen on an observation.

Data

The extracted Hogsmill observation data is available in machine-readable form, and is shown below in tabular form.

(The gen-bats-at-Hogsmill-bridge-dataset-inc.sh HTML creation script is available under an Apache 2.0 licence.)

Records: 81