Carol Walker / RF- Quarter horses running in snow at ranch, Shell, Wyoming, USA, February. (This image may be licensed either as rights managed or royalty free.)

Edwin Giesbers / RF- Juvenile Sumatran tiger (Panthera tigris sumatrae), aged four months, captive, occurs in Sumatra, Indonesia

Edwin Giesbers / RF- Sumatran tiger (Panthera tigris sumatrae) with cub, aged four months, captive, occurs in Sumatra, Indonesia. (This image may be licensed either as rights managed or royalty free.)