According to experts, Northern New England's annual amphibian migration is always dangerous and critters that cross roads to breed have been going through another challenge this year.

In every spring, many species of salamanders and frogs travel to vernal pools with a propose mate and lay eggs and offspring require numerous months to develop and grow legs before the pools dry up in summer.

According to wildlife officials, the migration is running a week or two behind this year and it is cutting into that serious development time. Eric Orff, a wildlife biologist with the National Wildlife Federation, said that millions of animals across Vermont, Maine and New Hampshire might get affected.

"With a late spring and climate change predicting hotter, drier summers, we're really in a race against time before these vernal pools dry up, leaving these animals stranded to die”, Orff said.

As per Mike Marchand, a wildlife biologist with New Hampshire Fish and Game, the state is house to five species that rely only on vernal pools, the wood frog and four kinds of salamanders, involving one that is endangered in the state and two that are of conservation concern.

The experts said all serve ecosystem roles, salamanders consume mosquito larvae and the frogs are a vital food source for other animals at all stages of their development. The critters begin moving on rainy nights when temperatures are in the 40s and 50s. Residents have been asked to do what they can in order to help the amphibians survive their trek.

The Harris Center for Conservation Education provide tanning to volunteers for its ‘Salamander Crossing Brigades’ since 2007. Recently, they have started photographing the markings on yellow spotted salamanders. Volunteers also count the critters that end up as road killers; however, the concentration is on the living.