Ecology (1) Density (1) Pruning (1) Reproduction (1) Crops--Phenology (1) Success (1) Spring (1) Spleen (1) Snowy owl (1) Snow (1) Rodents (1) Plant phenology (1) Phenology (1) Nest building (1) Lemmings (1) Cast-iron (1) Average (1) Nests (1) Influence (1) Infancy (1) Growth (1) Animales--Crecimiento (1) Nidificación (1) Fenología (1) Bazo (1) Roedores (1) Reproducción (1) Éxito (1) Primavera (1) Poda (1)