It's been said they're the UK's noisiest amphibian, and when you hear them it's difficult to disagree. If they lived in a city centre they'd probably get an ASBO. Natterjacks are equipped with an inflatable vocal sack under their chin which acts as a resonator allowing their churring mating song to be heard from over a kilometre away.
April is the best time to see and hear Natterjack Toads as they emerge from their winter burrows and make their way down to their breeding pools. On warm evenings you can hear the males calling from the ponds to attract the females.
After mating the Natterjacks release their spawn in a single string up to two metres long (photo of mating Natterjack Toads). The tadpoles usually hatch in about a week. This rapid development is necessary because they are often in shallow pools which can quickly dry out. Within four weeks they can be ready to leave the water as tiny toadlets, although they need a further 3-4 years to reach sexual maturity.
Natterjack Toads are found mainly in sandy, coastal areas of east and north-west England and because of their rarity, it's illegal to disturb them, or the places they inhabit. Here are a few locations where you might be lucky enough to see some, but be sure to check with the site owners/managers before visiting:
North Walney NNR, near Barrow in Furness
Sandscale Haws NNR, near Barrow-in Furness
Saltfleetby-Theddlethorpe Dunes NNR, Lincolnshire
Ainsdale Sand Dunes NNR, Formby, Merseyside, Sefton Coast
Cabin Hill NNR, Formby, Merseyside, Sefton Coast
Holkham NNR, Wells-next-the-Sea, Norfolk