Data from: Prey movement, size, and glossiness interact to impact praying mantid attack behaviours
Data files
Sep 26, 2025 version files 51.42 KB
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README.md
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Wangetal_2025DRYAD.csv
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Wangetal_analysis_dryad.R
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Abstract
When moving, animals are vulnerable to predation because movement can rapidly attract the attention of a predator. To reduce the risk of predation while moving, animals can use a variety of different strategies (e.g., erratic movement, colouration). These strategies often work in combination or may be influenced by other prey characteristics (e.g., size), but few studies have explored these interactions. Here, we investigate how movement trajectory (linear or erratic), prey size (small or large), and prey colouration (glossy or matte) interact to impact attack behaviour of giant rainforest mantids (Hierodula majuscula). We presented mantids with 3D animations of moving targets and filmed their response with a high-speed camera. As expected, mantids were more likely to track large than small targets and targets moving linearly than erratically. Counterintuitively, however, mantids were quicker to strike at erratically moving targets, perhaps because they more closely resembled preferred prey. When mantids attacked the target, their accuracy was influenced by the interaction of target trajectory and glossiness. As predicted, mantids had larger attack errors (i.e. lower accuracy) toward erratically moving glossy targets compared to linearly moving glossy targets or erratically moving matte targets. However, contrary to our prediction that linearly moving matte targets would be easiest to capture, these targets also elicited large attack errors, similar to those recorded for erratically moving glossy targets. Together, our results demonstrate that anti-predator tactics for prey in motion may interact in complex ways, and simple experimental scenarios may overlook context-dependent effects that emerge when multiple factors interact.
Yvonne Wang1, Devi Stuart-Fox1, Amanda M. Franklin1,2
Affiliations:
1 School of BioSciences, The University of Melbourne, Parkville, Vic., Australia
2 Department of Ecological, Plant and Animal Sciences, La Trobe University, Bundoora, Vic. Australia
Correspondence:
Amanda Franklin. email: a.franklin@latrobe.edu.au
ABSTRACT
Animals can use a variety of different strategies (e.g. erratic movement, colouration) to reduce the risk of predation. These strategies often work in combination or may be influenced by other prey characteristics (e.g., size). Here, we investigate how movement trajectory (linear or erratic), prey size (small or large) and prey colouration (glossy or matte) interact to impact attack behaviour of giant rainforest mantids (Hierodula majuscula). We presented mantids with animations of moving targets and filmed their response with a high-speed camera. This repository contains the associated data and analysis code for this experiment.
DATA COLLECTION DETAILS
This experiment investigated response of praying mantids to animated stimuli on a computer monitor in the laboratory. Data was collected from 17 female giant rainforest praying mantids (Hierodula majuscula) in April - May 2023. Each mantid was exposed to all eight treatments (i.e. linear vs erratic movement, glossy vs matte colouration, small vs large size).
ANALYSIS FILE
Wangetal_analysis_dryad.R:
Runs all GLMMS to investigate effects of glossiness, trajectory and size on mantid attack behaviours
DATASET
Wangetal_2025DRYAD.csv:
Behavioural data compiled from high speed videos of mantids attacking animated targets
Note: NA indicates not applicable because the mantids did not strike.
- uqID: unique identifier for every row (i.e. for every trial)
- day: experimental day number
- id: mantid ID number
- experience: trial number for each individual mantid
- glossiness: target glossiness treatment - glossy or matte
- size: target size treatment - large or small
- traj: target trajectory treatment - random or straight
- treatment: full treatment combination of target glossiness, size and trajectory
- animationrep: letter indicating the background scene used to create each animation
- track: response variable indicating whether or not the mantid tracked the target (Yes/No)
- track_no: a count of the number of times the target passed the mantid before the mantid struck at the target. Maximum number of pass-bys was 20.
- attack: response variable indicating whether or not the mantid attacked the target (Yes/No)
- hitscreen: response variable indicating whether or not the mantid strike hit the computer monitor (Yes/No)
- hittarget: response variable indicating whether or not the mantid strike hit the target (Yes/No)
- targethalfwidth: measured halfwidth of the target used to calibrate the attack error variable. Should be either 12mm for the large target or 8.4mm for the small target
The next eight columns are used to calculate the shortest distance between the centre of the target and the mantids arms during a strike. The values indicate the x,y coordinates of each arm at the start and end of a strike. A line is drawn between these two points for each arm and the shortest distance between that line and the target centre is extracted, for each arm. We then selected value from the arm with the smaller value. This is attack error (final column).
- leftarm_start_x: left arm, start of strike, x coordinate
- leftarm_start_y: left arm, start of strike, y coordinate
- leftarm_end_x: left arm, end of strike, x coordinate
- leftarm_end_y: left arm, end of strike, y coordinate
- rightarm_start_x: right arm, start of strike, x coordinate
- rightarm_start_y: right arm, start of strike, y coordinate
- rightarm_end_x: right arm, end of strike, x coordinate
- rightarm_end_y: right arm, end of strike, y coordinate
- attackerror: shortest distance mantid arm and target centre (mm)
