Slovakia issued a stamp on Great Bustard.Great Bustard (Otis tarda) is Slovakia\’s heaviest flying bird. It grows up to more than one meter with a wing span of up to 2.5 meters and the heaviest individuals can weigh up to 22 kg. This, originally a steppe bird, inhabits the agricultural landscape at an altitude up to 300 m above sea level. It feeds on both plant and animal food and harder seeds to a small degree. The plant food includes, in particular, leaves, buds, and flowers, whole plants of field crops and weeds. The animal food is mainly represented by insects, but occasionally the bird catches smaller vertebrates, for example voles, mice, lizards and even young birds. It nests on the ground, usually in the cereal crop and clover plants. For most of the year, the Great Bustards are concentrated in flocks, which dissipate during the nesting season.