A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding ...

Vector-borne pathogens are transmitted between ... PNAS 90(9): 4171-4175 (1993). Gandon S. Evolution of multi-host parasites. Evolution 58(3): 455-469 (2004). Garamszegi L.Z. Patterns of co ...

it is believed that dolphins and whales evolved from land animals and share lineage with hippos. But there are few examples that show evolution from water to land. The transition requires ...