When the continents joined 3 million years ago, the Great American Interchange resulted in many species being spread across the Americas, such as the cougar, porcupine, and hummingbirds.

When the bird raises its wings over its back, it shakes them back and forth over 100 times a second ( hummingbirds typically flap their wings only 50 times a second ).

When the larvae hatch, they feed on the beebread, although they also receive extra honey meals from their mother.

When the policy has been chosen, the state of the product can be obtained from the state of the feed by repeated application of the transformation ( 1 ) ; ;

When it is necessary to be specific we say that the optimal policy is an optimal R-stage policy with respect to the feed state Af.

When they are newly hatched, frog larvae feed on the yolk of the egg.

When this is exhausted some move on to feed on bacteria, algal crusts, detritus and raspings from submerged plants.

When monks and nuns who follow the Theravadan way feed themselves by alms, they must eat leftover foods which are given to them, including meat.

When the process feed has a diverse composition, as in distilling crude oil, liquid outlets at intervals up the column allow for the withdrawal of different fractions or products having different boiling points or boiling ranges.

When a transmitter is connected to an antenna by a feed line, the impedance of the antenna and feed line must match exactly for maximum energy transfer from the feed line to the antenna to be possible.

When they reach a desirable location they then get off, and at least in the lab they will also feed on the host if it dies.

When eating they ingest the whole plant, including the roots, although when this is impossible they will feed on just the leaves.

When moving along the seabed to feed they walk on their pectoral fins.

When Curtis was eight, he and his brother Julius were placed in an orphanage for a month because their parents could not afford to feed them.

When the chicks and the female are too big to fit in the nest, the mother breaks out, then both parents feed the chicks.

When the Greek fleet set out to make war in Troy, it was the Oenotropae who stocked their ships, and Agamemnon was so impressed with this that he abducted them in order to feed the Greek army.

When a ship was lost at sea, Ka-moho-alii shook his tail in front of the fleet and the kahuna would feed him " awa " ( a name for kava, a narcotic drink ), and Ka-moho-alii would guide the men home.

When preening, grebes eat their own feathers, and feed them to their young.

When Durvasa arrived there was no food left to serve him, and the Pandavas were very anxious as to what would be their fate if they failed to feed such a venerable sage.

When excavation for swimming pools was done, residents found dishes from New Orleans hotels and restaurants whose table scraps were once used to feed animals.

When fish or prawn are grown in ponds, it takes, typically of feed to produce of product ( dry-dry basis ).

When there is sufficient sunlight for it to feed by phototrophy, it uses chloroplasts containing the pigments Chlorophyll a and Chlorophyll b to produce sugars by photosynthesis.

When a load of feed was brought to town, the cattle and horses had to be chased away until it was unloaded in stack lots or barns.

When larvae emerge, they feed primarily on small mammals and birds.

When, in late afternoon on the last day in June, he saw two people top the ridge to the south and walk toward the house, he quit work immediately and strode to his rifle.

When he saw the expression in her eyes, he knew he couldn't send them on.

When they turned in the saddle they could see the men behind them, strung out on the prairie in a flat black line.

When one of the men in the hall behind us spat on the floor and scraped his boot over the gob of spittle I noticed how the clerk winced.

When they reached their neighbor's house, Pamela said a few polite words to Grace and kissed Melissa lightly on the forehead, the impulse prompted by a stray thought -- of the type to which she was frequently subject these days -- that they might never see one another again.

When Fred Powell's brother-in-law, Charlie Keane, moved into the dead man's home, the anonymous letter writer took no chances on Charlie taking up where Fred had left off and wasted no time on a first notice:

When I fell on my back, I saw a vulture hovering.

Joyce went on, `` When we'd finished, Lou -- Mr. Thor -- asked me to stay a little longer.

When we opened the door again for business and switched on the lights she said:

When he sank on his knees, they had allowed him to char without administering the stroke of mercy.

When he got closer to the tree, Matsuo noted the wild look on his face.

When he rolled on the left side, propping on his left elbow, Matsuo seized his hair and pulled him back over.

When her hand touched his, fire went through Jack and he felt weak, but he managed somehow to get her on her feet.

When he finally left the sinister mansion on Perdido Street, he was carried out in a coroner's basket.

When you pass a church on an Irish bus, all the hands flurry in the sign of the cross.

When he was stripped, deloused and numbered by his guards, his much-thumbed sketchbook was seized and thrown on a pile of prisoners' goods to be confiscated.

When combined with the metaphysical notion that pure forms of this universe are best appreciated when least embodied in a material substratum, it becomes clear that while earth will be dross on a scale of material-formal ratios, celestial bodies will be of a subtle, quickened, ethereal existence, in whose embodiment pure form will be the dominant component and matter will be absent or remain subsidiary.

When the family business failed, Mercer left school and on his mother's urging -- for she hoped that he would become an actor -- he joined a local little theater group.

Besides doing a single song, `` When The Sun Comes Out '', they worked on the ambitious American-Negro Suite, for voices and piano, as well as songs for films.

When I returned to make my report, the Hetman did not remember having sent me on the secret mission.

When Fred wheeled him back into his room, the big one looking out on the back porch, and put him to bed, Papa told him he was very tired but that he had enjoyed greatly the trip downtown.

When the young biologist, Dr. Ballard, began to show interest in our daughter Elizabeth, this induced a corresponding interest, on our part, in him.

When he turns briefly to literary style, in the Third Book, he again looks to the effect on the audience.