19 Many of our mammals are shy and elusive creatures, and different techniques are needed for their detection. Some groups are sufficiently active and visible by day to be watched directly, although in almost every case the early morning is the best time for observations. Rabbits and hares come into this category, as do squirrels and water voles, and you may be lucky and see harvest mice, which are more active by day than most other mice, especially in winter. These are easily recognised by their very small ears and rich orange brown coat. You may also be able to record some of the four species of deer (fallow, red, roe and muntjac) to be found in Essex. They do much of their feeding in clearings or open ground adjacent to woodland (and often motorways!), generally emerging at dusk to feed. However, dawn is again the best time for observation, since there is less human disturbance than at dusk. Despite the great increase in urban development the Essex deer survey revealed that deer are common over much of Essex and are living in extraordinarily" close proximity to towns. Both fallow and muntjac are frequently seen, and breed,in sites adjacent to Harlow New Town, and fallow deer have been seen from houses on the edge of Harold Hill and Harold Wood. Animals more commonly associated with urban and country habitats are foxes. They are often sighted in the garden or are picked out in car headlights. Although thought to occur throughout the county we have very few recent observations on record. Similarly, very few hedgehog sightings have been reported. These delightful animals, like others, are often only seen as road casualties.. However, such unfortunate incidences can produce valuable information on a species, and any details from road casualties involving wild mammals will be very useful to us.