GENERAL INFORMATION 1. Titles of the Dataset: Exploration speed (mean speed cm/sec) in mobile arena, exploration behaviour (behavioural bugdet walking and probing), isotope data (plasma and red blood cell), foraging behaviour collected from the observations in the field 2. Date of the data collection: Catching between 14 August - 19 September 2018, and 1 August - 6 September 2019, Field observations from August to October 2019 3. Geographic location of data collection: Western Dutch Wadden Sea (53°15'N, 5°15'E) 4. Corresponding author information: Selin Ersoy, NIOZ Royal Netherlands Institute for Sea Research, Department of Coastal Systems, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands, selin.ersoy@gmail.com 5. Link to publication: Ersoy et al. (2021) Exploration speed in captivity predicts foraging tactics and diet in free-living red knots. Journal of Animal Ecology DATA & FILE OVERVIEW 1. KnotData.csv: Metadata of individual red knots Column 1: CaptureDate: The date when the red knots were captured by means of mist-netting in the Western Duthc Wadden Sea (53°15'N, 5°15'E) Column 2: RingNr: Unique metal ring number of red knots. Ring were put on the legs Column 3: Crc: Unique combination of color-rings of red knots. Rings were placed on the legs (two in right and two in left legs) Column 4: Bill: Bill lenght of the individual in mm. Column 5: Mass: Body mass of the individual in gr. Column 6: cell_d15N: Isotope value from red blood cell d15N. Column 7: cell_d13C: Isotope value from red blood cell d13C. Column 8: plasma_d15N: Isotope value from blood plasma d15N. Column 9: plasma_d13C: Isotope value from blood plasma d13C. Column 10: Expl_F01_MeanSpeed: Exploratory personality score of individual measured in mobile arena for the first time (mean speed cm/sec) Column 11: Expl_F01_Log10MeanSpeed: Log10 transformed of the exploratory personality score of individual measured in mobile arena for the first time (mean speed cm/sec) Column 12: Expl_Date: The date that exploratory personality assay was conducted 2. ExplorationSpeedRepeatibility.csv: Data on repeated measurement (max. 4 repeats) on exploration speed (mean speed log10 cm/sec) measured in the mobile arena Column 1: RingNr: Unique metal ring number of red knots. Ring were put on the legs Column 2: MeanSpeed: Exploratory personality score of individual measured in mobile arena (mean speed cm/sec) Column 3: Expl_Date: The date that exploratory personality assay was conducted Column 4: Condition: Whether the individual bird was wildly captured or it was in captivity Column 5: Repeat_Nu: Repeat number of the personality assay trials 3. ExplorationValidation.cvs: Data on personality measurements on both mobile (FU) and indoor (WU) arenas. Exploration is scored both mean speed and behavioural budget as proportion of walking and probing Column 1: RingNr: Unique metal ring number of red knots. Ring were put on the legs Column 2: Expl_Date: The date that exploratory personality assay was conducted Column 3: Setup: Whether the personality was measured in mobile (FU) or indoor (WU) arenas. Column 4: Condition: Whether the individual bird was wildly captured or it was in captivity Column 5: PropExplBehaviour: Exploratory personality scored as behavioural budget as proportion of walking and probing Column 6: Mean_Expl_Speed: Exploratory personality scored as movement speed 4. ForagingFieldData.csv: Data on proportion of foraging tactics (tactile and visual) observed in the field. Column 1: RingNr: Unique metal ring number of red knots. Ring were put on the legs Column 2: Expl_F01_MeanSpeed: Exploratory personality score of individual measured in mobile arena for the first time (mean speed cm/sec) Column 3: gizzard_size: Gizzard size of the individual red knots measured through ultrasound (following Dekinga et al., 2001) Column 4: bill_length: Bill lenght of the individual in mm. Column 5: p_visual: Proportion of visual foraging observed in the field Column 6: p_tactile: Proportion of tactile foraging observed in the field 5. PreyForagingBehv.csv: Data on which foraging tactic (tactile and visual) result in catching what type of prey (soft and hard-shelled) observed in the field. Column 1: Obs_id: Field observation id. Combination of colour ring combination (crc) and the date of observation. Column 2: totalingested_prey: Number of total ingested prey observed from that observation Column 3: prey_type: Identified type of prey (shellfish, worm, shrimp, cockle) Column 4: Foraging: What types of foraging behaviour was observed during that ingestion (tactile vs visual) Column 5: Prey: Whether that prey type is hard-shelled or soft prey