Mammals – Transect Sign Surveys – Spain – 2022–2025 – MOMAT Project

For each UTM 10 × 10 km grid cell, a list of potentially detectable species was established based on species biology, known or nearby historical occurrences, and the reliability of species identification from field signs.Two types of itineraries were conducted:• Terrestrial itineraries: At least one transect of a minimum length of 1 km per grid cell.• Aquatic itineraries: Transects of 600 m along rivers, streams, or other aquatic habitats to detect species closely associated with water bodies.All itineraries were actively searched for signs of the target species.

Survey routes, effort (length and duration) and associated evidence were recorded. Data collection was carried out using the Observation.org platform and validated by the SECEM expert validation network. 6,201 occurrences (3,823 terrestrial + 2,378 aquatic) from 580 terrestrial and 487 aquatic events, covering 498 terrestrial and 424 aquatic LAEA 10 × 10 km grid cells. Records correspond to indirect field evidence of mammal presence and are classified as HumanObservation.