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(1) These two types of dog can interbreed/be interbred .

(2) Some of the wolves had interbred with domestic dogs.

(3) Since the birds interbreed they cannot be classed as different species.

(4) Did they trade, make war, interbreed?

(5) Their energy and physique had been sapped by interbreeding.

(6) Fish of different shape are already reluctant to interbreed.

(7) There, he said, many animals interbred and created monsters.

(8) Of the few species that do have the opportunity to interbreed, none do so frequently.

(9) Theoretically, as we have seen, a species is a form which can not interbreed successfully with any other.

(10) Varieties and eventually species would be formed despite any tendency for interbreeding with the main body of the population in the centre.

(11) Although they can be prevailed upon to interbreed in captivity, they never do so in the wild.

(12) Interbreeding with feral cats is probably the biggest threat to the wildcat.

(13) The number of interbreeding populations is unknown, as are chances for long-term survival.

(14) Gray moths still could interbreed with black moths[sentencedict.com/interbred.html], proving that they belonged to the same species.

(15) Gloucestershire cattleman Guy Wooding will judge the inter-breed championship on the afternoon before the sale.

(16) Research suggests humans, Neanderthals interbred.

(17) DNA has even shown that a few Neandertals interbred with our ancestors.

(18) Shanle oilfield is an ultra-low permeability coal series interbred reservoir in Tuba field with special geo-logic condition and complex structures.

(19) More interesting, when these ticklish rats were interbred for four generations(sentencedict.com), the offspring chirped twice as often as their great-grandparents.

(20) The study shows that Denisovans interbred with the ancestors of the present day people of the Melanesian region north and north-east of Australia.

(21) They looked for signs that their ancestors interbred with the Denisovans, a recently discovered human group known only from the DNA in tooth and bone fragments found in Siberia.

(22) Their ruthless pursuit of Navajos in the 1860s led to isolation of a small band, which interbred, risking genetic disorders.

(23) Woolly and Columbian mammoths, two species of elephant that once lived in North America, may have interbred.

(24) Such experiments put humanity and nature alike into great pain, for the two sets of DNA were never devised to be interbred and the blending of such put the associated forms into agony.

(25) Such percentages provide clues on how modern humans migrated and interbred.

(26) The Denisovan genome has already revealed that the ancestors of modern New Guineans interbred with them.

(27) Competing theories place them either as an archaic variant of our own species, Homo sapiens, with whom we interbred, or as a separate species altogether.

(28) Our idea is that the ancestors of Melanesians met the Denisovans in Southeast Asia and interbred, and the ancestors of Melanesians then moved on to Papua New Guinea.

(29) Some even argued that Neanderthals didn't go extinct at all, but interbred with H. sapiens.

(30) The reason for this is that the 70 who died had interbred with all root races over time.